Critical angle of electromagnetic radiation takes place if (A) Angle of incidence is equal to angle of refraction (B) Angle of incidence is greater than the angle of refraction (C) Angle of incidence is equal to 90° (D) Angle of refraction is equal to 90°

Critical angle of electromagnetic radiation takes place if
(A) Angle of incidence is equal to angle of refraction
(B) Angle of incidence is greater than the angle of refraction
(C) Angle of incidence is equal to 90°
(D) Angle of refraction is equal to 90°
by

1 Answer

Answer :

Answer: Option D
by

Related questions

In case of reflection and refraction of electromagnetic radiation, (A) Angle of incidence = angle of refraction (B) Angle of incidence = angle of reflection (C) Angle of refraction = sum of the angles of incidence and refraction (D) All the above

Description : In case of reflection and refraction of electromagnetic radiation, (A) Angle of incidence = angle of refraction (B) Angle of incidence = angle of reflection (C) Angle of refraction = sum of the angles of incidence and refraction (D) All the above

Last Answer : Answer: Option B

According to the Snell's law if an electromagnetic wave is incident in a medium (refractive index n1) on another medium (refractive index m2); (A) The angle of incidence is equal to the angle of refraction (B) The angle of refraction r) is given by sin i (C) Both (a) and (b) (D) Neither (a) nor (b)

Description : According to the Snell's law if an electromagnetic wave is incident in a medium (refractive index n1) on another medium (refractive index m2); (A) The angle of incidence is equal to the angle of refraction (B) The angle of ... r) is given by sin i (C) Both (a) and (b) (D) Neither (a) nor (b)

Last Answer : Answer: Option B

The minimum angle of incidence at which the light ray may strike the interface of two media and result in an angle of refraction of 90 degrees or greater. ∙ A. optimum angle ∙ B. angle of refraction ∙ C. refracted angle ∙ D. critical angle

Description : The minimum angle of incidence at which the light ray may strike the interface of two media and result in an angle of refraction of 90 degrees or greater. ∙ A. optimum angle ∙ B. angle of refraction ∙ C. refracted angle ∙ D. critical angle

Last Answer : D. critical angle

Light enters air from water. The angle of refraction will be A. Greater than the angle of incidence. B. Equal to the angle of incidence. C. Less than the angle of incidence. D. None of these

Description : Light enters air from water. The angle of refraction will be A. Greater than the angle of incidence. B. Equal to the angle of incidence. C. Less than the angle of incidence. D. None of these

Last Answer : C. Less than the angle of incidence.

A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers. (1) reflection (2) refraction (3) diffraction (4) total internal reflection

Description : A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers. (1) reflection (2) refraction (3) diffraction (4) total internal reflection

Last Answer : (4) total internal reflection Explanation: If the angle of incidence of light ray in the denser medium is greater than the critical angle of the concerned media pair, the light is not at all reflected in to the rarer medium but is totally reflected. This is known as 'total internal reflection'.

When a beam of light travels through media of two different densities, if theangle of incidence isgreater than the critical angle, _______ occurs. A) reflection B) refraction C) incidence D) criticism

Description : When a beam of light travels through media of two different densities, if theangle of incidence isgreater than the critical angle, _______ occurs. A) reflection B) refraction C) incidence D) criticism

Last Answer : reflection

A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers. (1) reflection (2) refraction (3) diffraction (4) total internal reflection

Description : A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers. (1) reflection (2) refraction (3) diffraction (4) total internal reflection

Last Answer :  total internal reflection

What is the condition for total internal reflection? (a) Angle of incidence is less than to critical angle (b) Angle of incidence is equal to critical angle (c) Angle of incidence is greater than to critical angle (d) None of these

Description : What is the condition for total internal reflection? (a) Angle of incidence is less than to critical angle (b) Angle of incidence is equal to critical angle (c) Angle of incidence is greater than to critical angle (d) None of these

Last Answer : (c) Angle of incidence is greater than to critical angle

Optical fiber uses reflection to guide light through a channel, in which angle of incidence is ................. the critical angle. (A) equal to (B) less than (C) greater than (D) less than or equal to

Description : Optical fiber uses reflection to guide light through a channel, in which angle of incidence is ................. the critical angle. (A) equal to (B) less than (C) greater than (D) less than or equal to

Last Answer : (C) greater than

Total internal reflection takes place if the light ray strikes the interface at an angle with what relationship to the critical angle? ∙ A. less than ∙ B. greater than ∙ C. equal to ∙ D. zero

Description : Total internal reflection takes place if the light ray strikes the interface at an angle with what relationship to the critical angle? ∙ A. less than ∙ B. greater than ∙ C. equal to ∙ D. zero

Last Answer : ∙ B. greater than

On a rainy day, small oil films on water show brilliant colors'. This is due to A. dispersion B. interference C. diffraction D. Polarization 49.The critical angle for a beam of light passing from water into air is 48.8 °. This means that all light rays with an angle of incidence greater than this angle will be A. absorbed B. totally reflected C. Partially reflected and partially transmitted D. Totally transmitted

Description : On a rainy day, small oil films on water show brilliant colors'. This is due to A. dispersion B. interference C. diffraction D. Polarization 49.The critical angle for a beam of light ... A. absorbed B. totally reflected C. Partially reflected and partially transmitted D. Totally transmitted

Last Answer : C. Partially reflected and partially transmitted

If the angle of incidence formed on a concave mirror at a point is 30° then the angle of reflection will be: (1) 15° (2) 30° (3) 60° (4) 90°

Description : If the angle of incidence formed on a concave mirror at a point is 30° then the angle of reflection will be: (1) 15° (2) 30° (3) 60° (4) 90°

Last Answer : (2) 30° Explanation: The angle between the incident ray and the normal is known as the angle of inci dence. The angle between the reflected ray and the normal is known as the angle of reflection.

A radio signal moves from air to glass. The angle of incidence is 20°. Calculate the angle of refraction. The relative permittivity of the glass is 7.8. A. 7.8° B. 5.04° C. 6.04° D. 7.04°

Description : A radio signal moves from air to glass. The angle of incidence is 20°. Calculate the angle of refraction. The relative permittivity of the glass is 7.8. A. 7.8° B. 5.04° C. 6.04° D. 7.04°

Last Answer : D. 7.04°

The Brewster angle is the angle of a) Incidence b) Reflection c) Refraction d) Transmission

Description : The Brewster angle is the angle of a) Incidence b) Reflection c) Refraction d) Transmission

Last Answer : a) Incidence

Medium 1 is a glass (n1 = 1.5) and medium 2 is an ethyl alcohol (n2 = 1.36). For an angle of incidence of 30 degrees, determine the angle of refraction. ∙ A. 44.5 degrees ∙ B. 14.56 degrees ∙ C. 33.47 degrees ∙ D. 75 degrees

Description : Medium 1 is a glass (n1 = 1.5) and medium 2 is an ethyl alcohol (n2 = 1.36). For an angle of incidence of 30 degrees, determine the angle of refraction. ∙ A. 44.5 degrees ∙ B. 14.56 degrees ∙ C. 33.47 degrees ∙ D. 75 degrees

Last Answer : C. 33.47 degrees

It is the angle formed between the propagating ray and the normal after the ray has entered the second medium. ∙ A. angle of incidence ∙ B. angle of reflection ∙ C. propagation angle ∙ D. angle of refraction

Description : It is the angle formed between the propagating ray and the normal after the ray has entered the second medium. ∙ A. angle of incidence ∙ B. angle of reflection ∙ C. propagation angle ∙ D. angle of refraction

Last Answer : angle of reflection

At what value of crank angle (roughly), no flow of water from or into the air vessel takes place in case of a double acting reciprocating pump? (A) 40° and 140° (B) 45° and 60° (C) 90° and 80° (D) 20° and 120°

Description : At what value of crank angle (roughly), no flow of water from or into the air vessel takes place in case of a double acting reciprocating pump? (A) 40° and 140° (B) 45° and 60° (C) 90° and 80° (D) 20° and 120°

Last Answer : (A) 40° and 140

If the output of a dragline for 90° angle of swing at optimum depth of cut is X, then the output for 120° angle of swing at 120 % of optimum depth of cut will be (A) Equal to X (B) More than X (C) Less than X (D) Any of the above

Description : If the output of a dragline for 90° angle of swing at optimum depth of cut is X, then the output for 120° angle of swing at 120 % of optimum depth of cut will be (A) Equal to X (B) More than X (C) Less than X (D) Any of the above

Last Answer : (C) Less than X

Total internal reflection takes place if the light ray strikes the interface at an angle with what relationship to the critical angle? a. Less than b. Grater than c. Equal to d. Zero

Description : Total internal reflection takes place if the light ray strikes the interface at an angle with what relationship to the critical angle? a. Less than b. Grater than c. Equal to d. Zero

Last Answer : b. Grater than

Total internal reflection takes place if the light ray strikes the interface at an angle with what relationship to the critical angle? ∙ a. Less than ∙ b. Grater than ∙ c. Equal to ∙ d. Zer

Description : Total internal reflection takes place if the light ray strikes the interface at an angle with what relationship to the critical angle? ∙ a. Less than ∙ b. Grater than ∙ c. Equal to ∙ d. Zer

Last Answer : ∙ b. Grater than

If the long chord and tangent length of a circular curve of radius R are equal the angle of deflection, is (A) 30° (B) 60° (C) 90° (D) 120°

Description : If the long chord and tangent length of a circular curve of radius R are equal the angle of deflection, is (A) 30° (B) 60° (C) 90° (D) 120°

Last Answer : D

A member is balanced at its end by two inclined members carrying equal forces. For equilibrium the angle between the inclined bars must be (A) 3° (B) 45° (C) 90° (D) 120°

Description : A member is balanced at its end by two inclined members carrying equal forces. For equilibrium  the angle between the inclined bars must be  (A) 3°  (B) 45°  (C) 90°  (D) 120° 

Last Answer : (D) 120° 

The angle between the directions of the failure and the major principal plane, is equal to (A) 90° + effective angle of shearing resistance (B) 90° + half of the angle of shearing resistance (C) 45° - half of the angle of shearing resistance (D) 45° + half of the angle of shearing resistance

Description : The angle between the directions of the failure and the major principal plane, is equal to (A) 90° + effective angle of shearing resistance (B) 90° + half of the angle of shearing resistance (C) 45° - half of the angle of shearing resistance (D) 45° + half of the angle of shearing resistance

Last Answer : Answer: Option D

At a certain time, the MUF for transmission at an angle of incidence of 75° is 17 MHz. What is the critical frequency? A. 4.4 MHz B. 3.5 MHz C. 6.5 MHz D. 1.5 MHz

Description : At a certain time, the MUF for transmission at an angle of incidence of 75° is 17 MHz. What is the critical frequency? A. 4.4 MHz B. 3.5 MHz C. 6.5 MHz D. 1.5 MHz

Last Answer : A. 4.4 MHz

The critical angle is defined as the angle of incidence at which the total internal reflection starts to occur. State True/False. a) True b) False

Description : The critical angle is defined as the angle of incidence at which the total internal reflection starts to occur. State True/False. a) True b) False

Last Answer : a) True

The maximum angle in which external light rays may strike the air/glass interface and still propagate down the fiber. ∙ A. Acceptance cone half-angle ∙ B. Acceptance cone ∙ C. Critical angle ∙ D. Angle of incidence

Description : The maximum angle in which external light rays may strike the air/glass interface and still propagate down the fiber. ∙ A. Acceptance cone half-angle ∙ B. Acceptance cone ∙ C. Critical angle ∙ D. Angle of incidence

Last Answer : A. Acceptance cone half-angle

Pick out the correct statement. (A) Higher is the temperature of the radiating body, higher is the wavelength of radiation (B) Logarithmic mean area is used for calculating the heat flow rate through a thick walled cylinder (C) The wavelength corresponding to maximum mono-chromatic emissive power increases with rise in temperature (D) Solid angle subtended by the finite surface at the radiating element is called the angle of incidence

Description : Pick out the correct statement. (A) Higher is the temperature of the radiating body, higher is the wavelength of radiation (B) Logarithmic mean area is used for calculating the heat flow rate ... ) Solid angle subtended by the finite surface at the radiating element is called the angle of incidence

Last Answer : (B) Logarithmic mean area is used for calculating the heat flow rate through a thick walled cylinder

What is the hypothesis of the conditional statementAn angle is obtuse if its measure is greater than 90°.?

Description : What is the hypothesis of the conditional statementAn angle is obtuse if its measure is greater than 90°.?

Last Answer : The measure of an angle is greater than 90°.

Self-locking takes place when a) Coefficient of friction is equal to or greater than the tangent of the helix angle b) Coefficient of friction is lesser than or equal to the tangent of the helix angle c) Coefficient of friction is equal to or greater than the tangent of the helix angle d) None of the mentioned

Description : Self-locking takes place when a) Coefficient of friction is equal to or greater than the tangent of the helix angle b) Coefficient of friction is lesser than or equal to the tangent of the helix ... friction is equal to or greater than the tangent of the helix angle d) None of the mentioned

Last Answer : c) Coefficient of friction is equal to or greater than the tangent of the helix angle

Assume that a ray of light passes from glass into air at an angle of incidence greater than zero degrees. Will the ray of light be bent toward or away from the normal as it passes into the air?

Description : Assume that a ray of light passes from glass into air at an angle of incidence greater than zero degrees. Will the ray of light be bent toward or away from the normal as it passes into the air?

Last Answer : ANSWER: AWAY FROM

A light ray traveling in benzene strikes the benzene-air surface at the critical angle. The angle of refraction of the light ray is: w) 30 degrees x) 60 degrees y) 90 degrees z) 180 degrees

Description : A light ray traveling in benzene strikes the benzene-air surface at the critical angle. The angle of refraction of the light ray is: w) 30 degrees x) 60 degrees y) 90 degrees z) 180 degrees

Last Answer : ANSWER: Y -- 90 DEGREES

An Electromagnetic wave falls on to a boundary between two losses less homogeneous media with different refractive indices, a part of the wave is reflected back to the incident medium and the rest is transmitted on to the second media". This phenomenon is known as: (A) Fresnel reflection (B) Fresnel refraction (C) Snell's law (D) None of these

Description : An Electromagnetic wave falls on to a boundary between two losses less homogeneous media with different refractive indices, a part of the wave is reflected back to the incident medium and the rest is transmitted ... A) Fresnel reflection (B) Fresnel refraction (C) Snell's law (D) None of these

Last Answer : Answer: Option A

A traverse deflection angle is (A) Less than 90° (B) More than 90° but less than 180° (C) The difference between the included angle and 180° (D) The difference between 360° and the included angle

Description : A traverse deflection angle is  (A) Less than 90°  (B) More than 90° but less than 180°  (C) The difference between the included angle and 180°  (D) The difference between 360° and the included angle 

Last Answer : (C) The difference between the included angle and 180° 

The angle of intersection of a contour and a ridge line, is (A) 30° (B) 45° (C) 60° (D) 90°

Description : The angle of intersection of a contour and a ridge line, is  (A) 30°  (B) 45°  (C) 60°  (D) 90° 

Last Answer : (D) 90° 

ABCD is a regular parallelogram plot of land whose angle BAD is 60°. If the bearing of the line AB is 30°, the bearing of CD, is (A) 90° (B) 120° (C) 210° (D) 270°

Description : ABCD is a regular parallelogram plot of land whose angle BAD is 60°. If the bearing of the line AB is 30°, the bearing of CD, is (A) 90° (B) 120° (C) 210° (D) 270°

Last Answer : (C) 210°

A lemniscate curve will not be transitional throughout, if its deflection angle, is (A) 45° (B) 60° (C) 90° (D) 120°

Description : A lemniscate curve will not be transitional throughout, if its deflection angle, is (A) 45° (B) 60° (C) 90° (D) 120°

Last Answer : (A) 45°

An angle of deflection right, may be directly obtained by setting the instrument to read (A) Zero on back station (B) 180° on back station (C) 90° (D) 270° on back station

Description : An angle of deflection right, may be directly obtained by setting the instrument to read (A) Zero on back station (B) 180° on back station (C) 90° (D) 270° on back station

Last Answer : (A) Zero on back station

If the shearing stress is zero on two planes, then the angle between the two planes is (A) 45° (B) 90° (C) 135° (D) 225°

Description : If the shearing stress is zero on two planes, then the angle between the two planes is (A) 45° (B) 90° (C) 135° (D) 225°

Last Answer : Answer: Option B

Maximum number of vehicles can be parked with (A) Parallel parking (B) 30° angle parking (C) 45° angle parking (D) 90° angle parking

Description : Maximum number of vehicles can be parked with (A) Parallel parking (B) 30° angle parking (C) 45° angle parking (D) 90° angle parking

Last Answer : Answer: Option D

When the width of car parking space and width of street are limited, generally preferred parking system is (A) Parallel parking (B) 45° angle parking (C) 65° angle parking (D) 90° angle parking

Description : When the width of car parking space and width of street are limited, generally preferred parking system is (A) Parallel parking (B) 45° angle parking (C) 65° angle parking (D) 90° angle parking

Last Answer : Answer: Option A

A ship strikes the berth generally at an angle (A) 90° with the face of the dock (B) 45° with the face of the dock (C) 30° with the face of the dock (D) 10° with the face of the dock

Description : A ship strikes the berth generally at an angle (A) 90° with the face of the dock (B) 45° with the face of the dock (C) 30° with the face of the dock (D) 10° with the face of the dock

Last Answer : (D) 10° with the face of the dock

Plywood is made by bonding together thin layers of wood in such a way that the angle between grains of any layer to grains of adjacent layers is (A) 0° (B) 30° (C) 45° (D) 90°

Description : Plywood is made by bonding together thin layers of wood in such a way that the angle between grains of any layer to grains of adjacent layers is (A) 0° (B) 30° (C) 45° (D) 90°

Last Answer : Answer: Option D

How is the value of angle of refraction greater than 90 degrees in full internal reflection ?

Description : How is the value of angle of refraction greater than 90 degrees in full internal reflection ?

Last Answer : The angle of inclination of the density medium for which the value of its angle of refraction is 90 degrees is called the angle of incidence. If the value of the angle of refraction is not ... will be no full internal reflection. Thus the value of full internal reflection is more than 90 degrees.

Coherence of two electromagnetic waves takes place if their phase difference is: A) Constant in time (B) Constant in space (C) Constant in time and space (D) None of these

Description : Coherence of two electromagnetic waves takes place if their phase difference is: A) Constant in time (B) Constant in space (C) Constant in time and space (D) None of these

Last Answer : Answer: Option C

Energy in reflected light : (1) does not depends on the angle of incidence (2) increases with the increase in angle (3) decreases with the increase in angle of incidence (4) becomes maximum for angle of incidence equal to 45°

Description : Energy in reflected light : (1) does not depends on the angle of incidence (2) increases with the increase in angle (3) decreases with the increase in angle of incidence (4) becomes maximum for angle of incidence equal to 45°

Last Answer : (2) increases with the increase in angle Explanation: Reflected waves are simply those waves that are neither transmitted nor absorbed, but are reflected from the surface of the medium they encounter. The ... depends on the nature of the surface and the angle at which the wave strikes the surface.

Energy in reflected light : (1) does not depends on the angle of incidence (2) increases with the increase in angle (3) decreases with the increase in angle of incidence (4) becomes maximum for angle of incidence equal to 45°

Description : Energy in reflected light : (1) does not depends on the angle of incidence (2) increases with the increase in angle (3) decreases with the increase in angle of incidence (4) becomes maximum for angle of incidence equal to 45°

Last Answer : (2) increases with the increase in angle Explanation: Reflected waves are simply those waves that are neither transmitted nor absorbed, but are reflected from the surface of the medium they encounter. The ... depends on the nature of the surface and the angle at which the wave strikes the surface.

The angle of incidence is equal to the angle of reflection for perfect reflection. State True/False. a) True b) False

Description : The angle of incidence is equal to the angle of reflection for perfect reflection. State True/False. a) True b) False

Last Answer : a) True

The angle of incidence for a wave A. can be measured between the incident ray and the normal B. can be measured between the incident wave front and the boundary C. is equal to the angle of reflection D. all of the above

Description : The angle of incidence for a wave A. can be measured between the incident ray and the normal B. can be measured between the incident wave front and the boundary C. is equal to the angle of reflection D. all of the above

Last Answer : D. all of the above

When light is reflected from a surface, the angle of incidence is: w) 30 degrees x) equal to the angle of reflection y) 90 degrees z) 180 degrees

Description : When light is reflected from a surface, the angle of incidence is: w) 30 degrees x) equal to the angle of reflection y) 90 degrees z) 180 degrees

Last Answer : ANSWER: X -- EQUAL TO THE ANGLE OF REFLECTION

Energy in reflected light : (1) does not depends on the angle of incidence (2) increases with the increase in angle (3) decreases with the increase in angle of incidence (4) becomes maximum for angle of incidence equal to 45°

Description : Energy in reflected light : (1) does not depends on the angle of incidence (2) increases with the increase in angle (3) decreases with the increase in angle of incidence (4) becomes maximum for angle of incidence equal to 45° 

Last Answer : increases with the increase in angle