Description : The refractive indices of four media A, B, C and D are given in the following table: light-reflection-and-refraction-chapter-wise-important-questions-class-10-science-9 If light, travels from one medium to another, in which case the change in speed will be (i) minimum, (ii) maximum? -Physics
Last Answer : (i) Minimum change is seen as light moves between 1.50 and 1.52, i.e. B and C. (ii) Maximum change when light moves between 1.33 and 2.40, i.e. A and D.
Description : 4. If a light ray IM is incident on the surface AB as shown, identify the correct emergent ray. [Delhi (C)] -Chemistry-10
Last Answer : Answer. Ray NQ, as it has to be parallel to ray OS.
Description : The elements of the third period of the Periodic Table are given below: periodic-classification-of-elements-chapter-wise-important-questions-class-10-science-1 (a) Which atom is bigger, Na or Mg? Why? (6) Identify the most (i) metallic and (ii) non-metallic element in Period 3. -Science
Last Answer : (a) Sodium is bigger than magnesium as it has lesser nuclear charge so there is less force of attraction between nucleus and valence electrons and less effective nuclear charge. It is, therefore, ... the most non-metallic element because it can gain electrons easily due to its smallest atomic size.
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 : 13. A ray of light, incident obliquely on a face of a rectangular glass slab placed in air, emerges from the opposite face parallel to the incident ray. State two factors on which the lateral displacement of the emergent ray depends. [Foreign] -Chemistry-10
Last Answer : Lateral displacement depends on the: angle of incidence, thickness of slab, and refractive index of the material. (any two)
Description : (a) Write the essential condition for the following reaction to take place: 2AgBr--> 2Ag + Br2 Write one application of this reaction. (b) Complete the following chemical equation of a chemical ... science-5 (c) What happens when water is added to quick line. Write chemical equation. -Chemistry
Last Answer : Answer. This reaction is used in photography. (c) Slaked lime is formed with hissing sound and lot of heat is envolved.
Description : Rainbows are produced when sunlight (1) Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction (2) Incident on rain drops hanging in the atmosphere is dispersed ... atmosphere is dispersed after suffering reflection. (4) None of the given statements is correct.
Last Answer : (2) Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection. Explanation: When the light rays from the Sun are incident on water drops hanging in ... results in production of colour arcs which appear hanging in the sky and known as rainbow.
Description : Rainbows are produced when sunlight : (1) Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction (2) Incident on rain drops hanging in the atmosphere is dispersed ... atmosphere is dispresed after suffering reflection. (4) None of the given statements is correct.
Last Answer : Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and 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'.
Last Answer : total internal reflection
Description : When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is - (1) the violet ray (2) the red ray (3) the green ray (4) the blue ray
Last Answer : (2) the red ray Explanation: Red is deviated the least and violet the most.
Description : Light waves projected on oil surface show seven colours due to the phenomenon of (1) polarisation (2) refraction (3) reflection (4) interference
Last Answer : (4) interference Explanation: In physics, interference is a phenomenon in which two waves superpose to form a resultant wave of greater, lower, or the same amplitude.
Description : A light wave is incident over a plane surface with velocity x. After reflection the velocity becomes- (1) x/2 (2) x (3) 2x (4) x/4
Last Answer : (2) x Explanation: When a ray of light incident on a boundary separating two media comes back into the same media, this phenomenon, is called reflection of light. After reflection velocity, wavelength and frequency of light remains same but intensity decreases.
Description : A light wave is incident over a plane surface with velocity x. After reflection the velocity becomes :
Last Answer : x
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 : 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
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
Description : Diamonds are glittering and attractive because light incident on them undergoes – (1) highest refraction (2) multiple internal reflections (3) multiple surface reflections (4) hundred percent transmission
Last Answer : (2) multiple internal reflections Explanation: Diamond has remarkable optical characteristics. Because of its extremely rigid lattice, it can be contaminated by very few types of impurities, such as boron and ... ), brown (lattice defects), green (radiation exposure), purple, pink, orange or red.
Description : Diamonds are glittering and attractive because light incident on them undergoes (1) highest refraction (2) multiple internal reflections (3) multiple surface reflections (4) hundred percent transmission
Last Answer : multiple internal reflections
Description : A beam of light is incident on a large block of glass. The index of refraction of the glass is greater than one. Is the wavelength of the light in the glass: w) longer than x) shorter than y) the same as the wavelength of the light in the air?
Last Answer : ANSWER: X -- SHORTER THAN
Description : Light is normally incident on a thin soap film and is reflected. If the wavelength of this light is "L" and the index of refraction of the soap film is "N", complete destructive interference will occur for a film thickness of: w) L / 8N x) L / 4N y) L / 2N z) 3L / 4N
Last Answer : ANSWER: Y -- L / 2N
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 : 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
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
Description : When a pencil is dipped in glass of water it appears bent near the surface of water due to ______ of light. a) refraction b)reflection c)bouncing back of light d)none
Last Answer : a) refraction
Description : ‘Mirage' is an example of - (1) Refraction of light only (2) Total internal reflection of light only (3) Refraction and total internal reflection of light (4) Dispersion of light only
Last Answer : (3) refraction and total internal reflection of light
Description : 'Mirage' is an example of – (1) refraction of light only (2) total internal, reflection of light only (3) refraction and total internal reflection of light (4) dispersion of light only
Last Answer : (3) refraction and total internal reflection of light Explanation: A mirage is a naturally occurring optical phenomenon in which light rays are bent to produce a displaced image of distant objects ... significantly warmer air, the light rays bend away from the direction of the temperature gradient.
Description : A star appears twinkling in the sky because of – (1) scattering of light by atmosphere (2) reflection of light by atmosphere (3) refraction of light by atmosphere (4) diffraction of light by atmosphere
Last Answer : (3) refraction of light by atmosphere Explanation: A star appears twinkling in the sky because of refraction of light, by atmosphere. Light bends when it passes obliquely from one medium to another. This is called refraction of light.
Description : Which one of the following processes is responsible for the glittering of air bubble rising through water? (1) Reflection of light (2) Refraction of light (3) Total internal reflection of light (4) Scattering of light
Last Answer : (3) Total internal reflection of light Explanation: Total internal reflection is responsible for glittering which occurs when the light from a denser media (liquid) tries to enter less dense media (air in bubble). This reflected light when captured by our eyes is seen as glittering.
Description : A water tank appears shallower when it is viewed from top due to – (1) rectilinear propagation of light (2) reflection (3) total internal reflection (4) refraction
Last Answer : (4) refraction Explanation: This phenomenon is because of refraction of light. The lines of sight intersect at a higher position than where the actual rays originated. This causes the water to appear shallower than it really is.
Description : Formation of shadows can be explained by - (1) rectilinear propagation of light (2) reflection (3) refraction (4) total internal reflection
Last Answer : (1) rectilinear propagation of light Explanation: In this position, the head light will be at the principal focus so that the rays of light falling on the concave mirror will be rendered parallel
Description : The redness in atmosphere at Sunrise and Sunset is due to – (1) Refraction of light (2) Reflection of light (3) Dispersion of light (4) Scattering of light
Last Answer : (4) Scattering of light Explanation: The red colour in the sky at sunset (and sunrise) is due to an effect called Rayleigh scattering. At sunrise or sunset, since the Sun is low on the horizon, ... through more of the atmosphere - and therefore bounce off more molecules -than at other times of day.
Last Answer : (4) refraction Explanation: This phenomenon is because of refraction of light. The lines of sight intersect at a higher position than where the actual rays originated. This causes the water to appear ... depth that the water appears to be when viewed from above is known as the apparent depth.
Description : The splitting of white light into its components is due to: (1) Reflection (2) Refraction (3) Transmission (4) Dispersion
Last Answer : (4) Dispersion Explanation: Dispersion is used to separate a beam of white light into its constituent spectrum of colours. This phenomenon leads to rainbow.
Description : The phenomenon of change in direction of light when it passes from one medium to another is called - (1) Propagation (2) Reflection (3) Refraction (4) Dispersion
Last Answer : (3) Refraction Explanation: Refraction is the change in direction of wave propagation due to a change in its transmission medium. Due to the change of medium, the phase velocity of the wave is changed but its frequency remains constant.
Description : What is the reason for twinkling of stars? (1) Dispersion of light (2) Total internal reflection (3) Atmospheric reflection (4) Atmospheric refraction
Last Answer : (4) Atmospheric refraction Explanation: Seismometers are instrument that measures motion of the ground, including those of seismic waves generated by earthquakes, volcanic eruptions and other seismic ... of these different sources. Seismograph is another Greek term meaning to draw siesmo waves.
Description : The phenomenon of light associated with the appearance of blue colour of the sky is – (1) Interference (2) Reflection (3) Refraction (4) Scattering
Last Answer : (4) Scattering Explanation: During daylight, the sky appears to be blue because air scatters blue sunlight more than it scatters red. At night, the sky appears to be a mostly dark surface ... day sky is a result of scattering, which is dominated by a smallparticle limit called Rayleigh scattering.
Description : "Tice splitting of different colours of light in a prism is : (1) Reflection of light (2) Dispersion light (3) Diffraction light (4) Refraction of light
Last Answer : (2) Dispersion light Explanation: The refractive index of many materials (such as glass) varies with the wavelength or colour of the light used, a phenomenon known as dispersion. This causes ... a wave depends on its frequency, or alternatively when the group velocity depends on the frequency.
Last Answer : (1) rectilinear propagation of light Explanation: In this position, the head light will be at the principal focus so that the rays of light falling on the concave mirror will be rendered parallel.
Description : The reason for a swimming pool to appear less deep than the actual depth is – (1) Refraction (2) Light scattering (3) Reflection (4) Interference
Last Answer : (1) Refraction Explanation: The apparent depth will look less that its real depth due to the refraction of light. Refraction is the bending of a wave when it enters a medium where it's speed is ... depends on the indices of refraction of the two media and is described quantitatively by Snell's Law.
Description : The sparkling of a diamond is due to – (1) total internal reflection of light (2) interference of light (3) polarisation of light (4) refraction of light
Last Answer : (1) total internal reflection of light Explanation: Diamonds sparkle because of the total internal reflection of light. Diamonds have a very high refractive index, meaning they slow light down much more ... so that light seems to get 'trapped' within the diamond giving it it's sparkly appearance.
Description : Light bends around sharp corners as a result of w) refraction x) reflection y) diffraction z) dispersion
Last Answer : ANSWER: Y -- DIFFRACTION
Last Answer : Total internal reflection of light
Description : The phenomenon of change in direction of light when it passes from one medium to another is called (1) Propagation (2) Reflection (3) Refraction (4) Dispersion
Last Answer : Refraction
Description : The redness in atmosphere at Sunrise and Sunset is due to : (1) Refraction of light (2) Reflection of light (3) Dispersion of light (4) Scattering of light
Last Answer : Scattering of light
Description : The splitting of white light into its components is due to: (1) reflection (2) refraction (3) transmission (4) dispersion
Last Answer : dispersion
Description : Fiber optics cable used in communication, works on the principle of (1) regular reflection of light (2) diffuse reflection of light (3) refraction of light (4) total internal reflection of light
Last Answer : total internal reflection of light
Description : A star appears twinkling in the sky because of (1) scattering of light by atmosphere (2) reflection of light by atmosphere (3) refraction of light by atmosphere (4) diffraction of light by atmosphere
Last Answer : refraction of light by atmosphere
Description : A water tank appears shallower when it is viewed from top due to (1) rectilinear propagation of light (2) reflection (3) total internal reflection (4) refraction
Last Answer : refraction
Description : The sparkling of a diamond is due to (1) total internal reflection of light (2) interference of light (3) polarisation of light (4) refraction of light