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 : If a light ray IM is incident on the surface AB as shown, identify the correct emergent ray. light-reflection-and-refraction-chapter-wise-important-questions-class-10-science-8 -Physics
Last Answer : Ray NQ, as it has to be parallel to ray OS.
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 mirage occurs because of – (1) Reflection by hot ground (2) Total internal reflection by layers of air (3) Interference of light (4) Diffraction of light
Last Answer : (2) Total internal reflection by layers of air Explanation: A mirage is a naturally occurring optical phenomenon in which light rays are bent to produce a displaced image of distant objects or the ... -changing mirage. Cold air is denser than warm air and has therefore a greater refractive index.
Description : The blue colour of water in the sea is due to – (1) absorption of other colours except blue by water molecules (2) scattering of blue light by water molecules (3) reflection of blue light by impurities in sea water (4) reflection of blue sky by sea water
Last Answer : (1) absorption of other colours except blue by water molecules Explanation: Almost all sunlight that enters the ocean is absorbed, except very close to the coast. The red, yellow, and green ... to the absorption and scattering of light. The blue wavelengths of light are scattered, similar to the
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 : 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 : 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.
Description : Fibre optics work on the principle of - (1) scattering of light (2) total internal absorption (3) total internal reflection (4) option rotation
Last Answer : (3) total internal reflection Explanation: An optical fibre is a cylindrical dielectric waveguide (non-conducting waveguide) that transmits light along its axis, by the process of total internal reflection.
Description : For a ray of light to suffer total internal reflection it has to pass from – (1) glass to water (2) water to glass (3) air to water (4) air to glass
Last Answer : (3) air to water Explanation: Total internal reflection is an optical phenomenon that happens when a ray of light strikes a medium boundary at an angle larger than a particular critical angle with respect to the normal to the surface.
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 : Total internal reflection can not take place when light goes from – (1) glass to water (2) water to glass (3) water to air (4) glass to air
Last Answer : (2) water to glass Explanation: For total internal reflection to occur the light must travel from a dense medium to a less dense medium (e.g. glass to air or water to air). It will not happen for light traveling from water (n=1.333) towards glass (n=1.52).
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'.
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 : Sound and light waves both _______. (1) have similar wavelength (2) obey the laws of reflection (3) travel as longitudinal waves (4) travel through vacuum
Last Answer : (2) obey the laws of reflection Explanation: The two laws of reflection of light are applicable to sound waves as well. The incident wave, the normal to the reflecting surface and the reflected wave at the point of incidence lie in the same plane.
Description : What is the phenomenon which established the transverse nature of light? (1) Reflection (2) Interference (3) Diffraction (4) Polarisation
Last Answer : (4) Polarisation Explanation: The phenomena which proves the transverse nature alight is polarization. Since the intensity of polarized light on passing through a tourmaline crystal changes, ... waves. Transverse waves are waves that are oscillating perpendicularly to the direction of propagation
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 : A soap bubble shows colours when illuminated with white light. This is due to – (1) Diffraction (2) Polarization (3) Interference (4) Reflection
Last Answer : (3) Interference Explanation: The iridescent colours of soap bubbles are caused by interfering of (internally and externally) reflected light waves and are determined by the thickness of the film. This phenomenon ... are the same as the phenomenon causing the colours in an oil slick on a wet road.
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 sky appears blue because of – (1) Atmospheric water vapour (2) Scattering of light (3) Reflection on sea water (4) Emission of blue wavelength by the sun
Last Answer : (2) Scattering of light Explanation: The sky is blue because the molecules in the air scatter light in the higher wavelengths (that is, the blue light), while lower wavelength light (that is ... reflected down from the scattering is blue, therefore a blue sky. This is called Rayleigh scattering.
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 : Stars appear twinkling because of ______ of light. (1) Reflection (2) Scattering (3) Emission (4) Absorption
Last Answer : (2) Scattering Explanation: The stars' light must travel through the Earth's multi-layered atmosphere, and as it does so it is refracted (bent) multiple times and in random directions. The phenomenon of ... star wink as though it is in motion. It is this action that our eyes translate as twinkling.
Description : In which one of the following the phenomenon of total internal reflection of light is used? (1) Formation of mirage (2) Working of binoculars (3) Formation of rainbow (4) Twinkling of stars
Last Answer : (3) Formation of rainbow Explanation: When the angle of incidence is greater than the critical angle, no refraction occurs. Instead, the incident beam is reflected, obeying the Law of Reflection. This ... , Total Internal Reflection occurs at the rear of the raindrop - the water-to-air interface.
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 : Fibre optics work on the principle of – (1) Scattering of light (2) Total internal absorption (3) Total internal reflection (4) Optical rotation
Last Answer : (3) Total internal reflection Explanation: An optical fiber (or optical fibre) is a flexible, transparent fiber made of glass (silica) or plastic, slightly thicker than a human hair. It ... science and engineering concerned with the design and application of optical fibers is known as fiber optics.
Description : Light bends around sharp corners as a result of w) refraction x) reflection y) diffraction z) dispersion
Last Answer : ANSWER: Y -- DIFFRACTION
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 : Which of the following phenomena suggest that light may be a transverse wave? w) reflection x) polarization y) photoelectric effect z) diffraction
Last Answer : ANSWER: X -- POLARIZATION
Last Answer : Total internal reflection of light
Description : What is the phenomenon which established the transverse nature of light ? (1) Reflection (2) Interference (3) Diffraction (4) Polarisation
Last Answer : Polarisation
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 : A light wave is incident over a plane surface with velocity x. After reflection the velocity becomes :
Last Answer : x
Description : Total internal reflection can not take place when light goes from : (1) glass to water (2) water to glass (3) water to air (4) glass to air
Last Answer : water to glass
Description : In which one of the following the phenomenon of total internal reflection of light is used ? (1) Formation of mirage (2) Working of binoculars (3) Formation of rainbow (4) Twinkling of stars
Last Answer : Formation of rainbow
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
Last Answer : total internal reflection
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 : For a ray of light to suffer total internal reflection it has to pass from : (1) glass to water (2) water to glass (3) air to water (4) air to glass
Last Answer : air to water
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 : Stars appear twinkling because of ......... of light. (1) Reflection (2) Scattering (3) Emission (4) Absorption
Last Answer : Scattering