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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catalyst
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phototherapy
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photothermolysis
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radiogrophy
C
Correct answer
Explanation
Photothermolysis is the process where light energy is converted into heat to target specific structures in the skin, such as hair follicles or pigment. The prefix 'photo' means light and 'thermolysis' means heat destruction.
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blue light
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infrared rays
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unltraviolet rays
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red light rays
C
Correct answer
Explanation
Ultraviolet rays have the shortest wavelengths in this context, are least penetrating due to absorption by surface layers, cause chemical reactions like vitamin D synthesis, and possess germicidal properties.
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When light does nothing
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When light hits an object and goes in every direction
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When light refracts
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When light hits an object
B
Correct answer
Explanation
Scattering occurs when light rays strike particles or surfaces and are redirected in various directions. This is the phenomenon responsible for the blue color of the sky.
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Light from the water is reflected off of the air
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Light from water particles is transmitted through the air
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Light from the sun is reflected off of water particles
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Light is internally reflected by the water
C
Correct answer
Explanation
Rainbows are formed when sunlight enters water droplets, undergoes refraction, internal reflection, and dispersion. Option C is the most accurate description provided among the choices.
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Yes
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No
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You can use many sources of light to create a rainbow
C
Correct answer
Explanation
A rainbow is simply a spectrum of light separated by water droplets. Any sufficiently bright white light source can create a rainbow effect if the conditions are met.
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Only at the same angle
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In the right setting possibly
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No
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Yes
C
Correct answer
Explanation
A rainbow is an optical phenomenon that depends on the specific position of the observer relative to the light source and the water droplets. Because each person stands in a different location, they see a unique rainbow.
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Where sound triggers light to be emitted
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Where white light splits up into different colours
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Where waves spread out
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Where any coloured light is refracted
B
Correct answer
Explanation
Dispersion is the process by which white light is separated into its constituent colors (the visible spectrum) due to the different refractive indices of the medium for different wavelengths.
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UV light
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germicidal light
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neon light
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high intensity light
A
Correct answer
Explanation
Laminar flow hoods are equipped with UV (ultraviolet) germicidal lamps to sterilize the interior surfaces before work begins.
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Opaque
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Transparent
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Translucent
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Corrosive
C
Correct answer
Explanation
Translucent materials allow some light to pass through but scatter it, making objects on the other side appear blurry.
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Opaque
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Transparent
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Translucent
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Corrosive
B
Correct answer
Explanation
Transparent materials allow light to pass through clearly, enabling one to see objects on the other side without distortion.
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Opaque
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Transparent
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Translucent
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Corrosive
A
Correct answer
Explanation
Opaque materials do not allow any light to pass through, meaning you cannot see through them at all.
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refraction
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dispersion
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Tyndall effect
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reflection
B
Correct answer
Explanation
Dispersion is the phenomenon where white light splits into its constituent colors (the spectrum) when passing through a prism or similar medium.
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Dispersion of light
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Scattering of light
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Total internal reflection of light
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Reflection of light from the earth
B
Correct answer
Explanation
At sunrise and sunset, sunlight travels through a thicker layer of the atmosphere. Blue light is scattered away, leaving mostly red light to reach the observer.
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Reflection, refraction and dispersion
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Refraction, dispersion and scattering
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Refraction, dispersion and internal reflection
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Dispersion, scattering and total internal reflection
C
Correct answer
Explanation
A rainbow is formed by the refraction, dispersion, and internal reflection of sunlight within water droplets in the atmosphere.
B
Correct answer
Explanation
Violet light has the shortest wavelength and the highest frequency among visible colors, causing it to experience the greatest refractive index in a prism. Consequently, it deviates the most from its original path.