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
Description : The Snell’s law is given by a) N1 sin θi = N2 sin θt b) N2 sin θi = N1 sin θt c) sin θi = sin θt d) N1 cos θi = N2 cos θt
Last Answer : a) N1 sin θi = N2 sin θt
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
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
Description : Pick up the correct statement from the following: (A) The minimum frequency of light for which no electrons are emitted, is called threshold frequency (B) Polarising angle of glass is 57.5° (C) At the polarising angle, the reflected and refracted rays are orthogonal (D) All the above
Last Answer : Answer: Option D
Description : A light wave enters a sheet of glass at a perfect right angle to the surface. Is the majority of the wave reflected, refracted, transmitted, or absorbed?
Last Answer : Transmitted.
Description : It is the angle at which the propagating ray strikes the interface with respect to the normal. ∙ A. refracted angle ∙ B. incident angle ∙ C. reflected angle ∙ D. critical angle
Last Answer : incident angle
Description : The angle of incidence of a wave of a wave with angle of transmission 45 degree and the refractive indices of the two media given by 2 and 1.3 is a) 41.68 b) 61.86 c) 12.23 d) 27.89
Last Answer : a) 41.68
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
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
Description : The Brewster angle is the angle of a) Incidence b) Reflection c) Refraction d) Transmission
Last Answer : a) Incidence
Description : Calculate the ratio of sine of incident angle to the sine of reflected angle when the refractive indices of medium 1 and 2 are given as 2.33 and 1.66 respectively. a) 0.71 b) 1.4 c) 2 d) 3.99
Last Answer : a) 0.71
Description : Find the permittivity of the surface when a wave incident at an angle 60 is reflected by the surface at 45 in air. a) 1.41 b) 3.5 c) 2.2 d) 1.73
Last Answer : d) 1.73
Description : A wave incident on a surface at an angle 60 degree is having field intensity of 6 units. The reflected wave is at an angle of 30 degree. Find the field intensity after reflection. a) 9.4 b) 8.4 c) 10.4 d) 7.4
Last Answer : c) 10.4
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.
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
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
Description : Assume a ray of light is incident on a smooth reflecting surface at an angle of incidence of 15 degrees to the normal. What is the angle between the incident ray and the reflected ray?
Last Answer : ANSWER: 30 DEGREES
Last Answer : increases with the increase in angle
Description : Find the Maxwell law derived from Ampere law. a) Div(I) = H b) Div(H) = J c) Curl(H) = J d) Curl(B) = D
Last Answer : c) Curl(H) = J
Description : Find the Maxwell equation derived from Faraday’s law. a) Div(H) = J b) Div(D) = I c) Curl(E) = -dB/dt d) Curl(B) = -dH/dt
Last Answer : c) Curl(E) = -dB/dt
Description : Poisson equation can be derived from which of the following equations? a) Point form of Gauss law b) Integral form of Gauss law c) Point form of Ampere law d) Integral form of Ampere law
Last Answer : a) Point form of Gauss law
Description : With Gauss law as reference which of the following law can be derived? a) Ampere law b) Faraday’s law c) Coulomb’s law d) Ohm’s law
Last Answer : c) Coulomb’s law
Description : Coulomb’s law can be derived from Gauss law. State True/ False a) True b) False
Description : The colour of the ocean appears blue because the sunlight falling on it is (a) Reflected (b) Refracted (c) Absorbed (d) Scattered
Last Answer : Ans:(d)
Description : Winch of the following is not true about X-rays? (1) have low penetrating power (2) travel with the speed of light (3) Can be reflected or refracted (4) can affect photographic plates
Last Answer : (1) have low penetrating power Explanation: X-rays and gamma rays are photons, i.e. high-energy light-waves. When emitted by a source, for example, radium or cobalt, located outside the body, they ... they can be used in diagnostic medicine to image human bones or human organs made opaque by a dye.
Description : The colour of the ocean appears to be blue because the sunlight falling on it is – (1) reflected (2) refracted (3) diffracted (4) scattered
Last Answer : (4) scattered Explanation: The reason the ocean is blue is due to the absorption and scattering of light. The blue wavelengths of light are scattered, similar to the scattering of blue light in the sky ... the red and weak in the blue, thus red light is absorbed quickly in the ocean leaving blue.
Description : ECE Board Exam March 1996 EIRP stands for _______________. A. effective isotropic refracted power B. effective and ideal radiated power C. effective isotropic reflected power D. effective isotropic radiated power
Last Answer : D. effective isotropic radiated power
Description : What factor determines whether a radio wave is reflected or refracted by the ionosphere?
Last Answer : Thickness of ionized layer.
Description : The interference in thin films is because (a) The film reflects some light (b) The film is thin enough so that refracted ray is close to reflected ray (c) The reflected ray undergo path change of λ/2 (d) All of above
Last Answer : (d) All of above
Description : When light falls on shiny surface it gets __________ . a) refracted b)reflected c)bent d)nothing happens
Last Answer : b)reflected
Description : Which of the following is not true about X-rays? (1) have low penetrating power (2) travel with the speed of light (3) Can be reflected or refracted (4) can affect photographic plates
Last Answer : have low penetrating power
Description : The colour of the ocean appears to be blue because the sunlight falling on it is (1) reflected (2) refracted (3) diffracted (4) scattered
Last Answer : scattered
Description : Find the reflection coefficient of a wave with an incident electric field of 5 units and reflected electric field of 2 units. a) 2.5 b) 0.4 c) 0.8 d) 1.2
Last Answer : b) 0.4
Description : Find the ratio of the refractive index of medium 1 to that of medium 2, when the incident and reflected angles are given by 300 and 450 respectively. a) 0.5 b) 1 c) 2 d) 4
Last Answer : c) 2
Description : What is Snell's law?
Last Answer : it states that the ratio of sine of angle of incidence/sine of angle of refraction=constant, for the light of given color and given pair of medium. where n1 and n2 are the indices of refraction of light in different materials.
Description : Snell's law is related with?
Last Answer : Refraction
Description : “Each point on a spherical wavefront may be considered a source of secondary spherical wavefronts”. This is known as the A. Snell’s law B. D’Alembert’s principle C. Appleton’s theory D. Huygen’s principle
Last Answer : D. Huygen’s principle
Description : What law does a light traveling in air optical fiber follow? A. Millman B. Snell’s C. Maxwell D. Huygen
Last Answer : B. Snell’s
Description : The reflectance from a surface is called specular reflection if it follows: (A)snell's law (B) Lambert's cosine law (C) Planktan's law (D) All of thes
Description : Light traveling in optical fiber follows which of the following principles. ∙ a. Huygen’s principle ∙ b. Reflection theory ∙ c. Light theory ∙ d. Snell’s law
Last Answer : d. Snell’s law
Description : Whose principle or law states that each point on a wave front may be considered a new wave source? Is it: A. Snell's Law B. Huygens’s Principle C. Young's Law D. Hertz's Law.
Last Answer : B. Huygens’s Principle
Description : Whose principle or law states that each point on a wavefront may be considered a new wave source? Is it: w) Snell's Law x) Huygen's Principle y) Young's Law z) Hertz's Law.
Last Answer : ANSWER: X -- HUYGEN'S PRINCIPLE
Description : As shown in Fig. `PQ` is a ray incident on prism `ABC`. Show the corresponding refracted and emergent rays. The critical angle for the material of the
Last Answer : As shown in Fig. `PQ` is a ray incident on prism `ABC`. Show the corresponding refracted and ... is refractive index of the material of prism ? .
Description : Find the maximum angle of refraction when a light ray is refracted from glass `(mu= 1.50)` to air.
Last Answer : Find the maximum angle of refraction when a light ray is refracted from glass `(mu= 1.50)` to air.
Description : Skip distance can be maximized by using the ____ radiation angle possible and the ____ frequency that will be refracted at that angle. A. lowest, lowest B. lowest, highest C. highest, lowest D. highest, highest
Last Answer : B. lowest, highest
Description : A refracted wave occurs when a wave passes from one medium into another medium. What determines the angle of refraction?
Last Answer : The density of the two mediums, and the velocity of the waves.
Description : The term critical angle describes ∙ A. the point at which light is refracted ∙ B. the point at which light becomes invisible ∙ C. the point at which light has gone from the refractive mode ... reflective mode ∙ D. the point at which light has crossed the boundary layers from one index to another
Last Answer : C. the point at which light has gone from the refractive mode to the reflective mode ∙