Physics ยท Science General
Optics and Light Properties
2,019 Questions
Optics and light properties focus on the behavior of light, including reflection, refraction, dispersion, and polarization. This topic also covers the wave nature of light, illumination, and the functioning of optical instruments like microscopes. Questions on these concepts are common in general science sections of SSC, Railways, and State exams.
Reflection and mirrorsRefraction and mediumsLight wave theoriesPolarization and intensity
Optics and Light Properties Questions
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Refraction of light
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Diffraction of light
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Dispersion of light
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Scattering of light
D
Correct answer
Explanation
The blue color of the sky is caused by Rayleigh scattering, where shorter wavelengths of sunlight are scattered more efficiently by atmospheric gases than longer wavelengths.
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Twinkling of stars at night
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Sun apparently higher in sky than it usually is
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Sun appearing red at sunset
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None of these
C
Correct answer
Explanation
Twinkling of stars and the apparent position of the sun are classic examples of atmospheric refraction. The red color of the sun at sunset is caused by the scattering of light, not refraction.
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Planets
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Stars
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Satellites
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None of these
B
Correct answer
Explanation
Stars are point sources of light, so their light is easily disrupted by atmospheric turbulence, causing twinkling. Planets appear as extended sources, so their light averages out and they do not twinkle.
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is scattered the most by smoke or fog.
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is scattered the least by smoke or fog.
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is absorbed the most by smoke or fog.
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moves fastest in air.
B
Correct answer
Explanation
Red light has the longest wavelength in the visible spectrum, which means it undergoes the least scattering by particles in the atmosphere, allowing it to travel longer distances.
A
Correct answer
Explanation
In a dispersive medium like glass, the refractive index is higher for shorter wavelengths. Since red light has the longest wavelength, it experiences the lowest refractive index and thus travels the fastest.
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reflect it.
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curve.
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absorb it.
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pass through.
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Transparent
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Absorption
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Opaque
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Translucent
B
Correct answer
Explanation
Absorption is the process where light energy is taken in by a material and converted into other forms of energy, such as heat, rather than being reflected or transmitted.
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bounce off the water.
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be soaked up by the water.
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bend as it passes through.
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pass through the water without a change.
C
Correct answer
Explanation
Refraction is the bending of light as it passes from one medium to another of different optical density, such as from air to water.
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a prism
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air
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a mirror
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water
A
Correct answer
Explanation
A prism is an optical element with polished, flat surfaces that refract light. Because different colors have different wavelengths, they refract at different angles, separating white light into its component colors.
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is reflected.
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is refracted.
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is absorbed.
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is turned into sound.
A
Correct answer
Explanation
The surface of water acts like a mirror when light strikes it, causing reflection. This reflection creates the image seen on the surface.
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it is very cold out
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it is very sunny out
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the light is traveling through water
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it strikes another object
D
Correct answer
Explanation
Light travels in a straight line until it interacts with matter, where it can be reflected, refracted, or absorbed.
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concrete sidewalk
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yellow cloth
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tree trunk
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aluminum foil
D
Correct answer
Explanation
Aluminum foil is a shiny, metallic surface that acts as a good mirror, reflecting a high percentage of incident light compared to dull or matte surfaces like concrete or cloth.
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when it strikes a shiny object
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when it travels through outer space
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when it travels through water and then through air
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when it strikes a dark-colored object
A
Correct answer
Explanation
Reflection is most efficient when light strikes a smooth, shiny surface, which minimizes diffuse reflection and maximizes specular reflection.
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in a circle.
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in a straight line.
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only to objects that are shiny.
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in a curved line.
B
Correct answer
Explanation
Light travels in straight lines in a uniform medium, a property known as rectilinear propagation.