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
What is the transmittance of a material?
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The fraction of light that is absorbed by the material
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The fraction of light that is reflected by the material
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The fraction of light that is transmitted by the material
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The fraction of light that is scattered by the material
C
Correct answer
Explanation
The transmittance of a material is a measure of how much light the material transmits. It is defined as the fraction of light that is transmitted by the material.
What is the reflectance of a material?
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The fraction of light that is absorbed by the material
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The fraction of light that is reflected by the material
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The fraction of light that is transmitted by the material
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The fraction of light that is scattered by the material
B
Correct answer
Explanation
The reflectance of a material is a measure of how much light the material reflects. It is defined as the fraction of light that is reflected by the material.
What is the absorptivity of a material?
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The fraction of light that is absorbed by the material
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The fraction of light that is reflected by the material
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The fraction of light that is transmitted by the material
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The fraction of light that is scattered by the material
A
Correct answer
Explanation
The absorptivity of a material is a measure of how much light the material absorbs. It is defined as the fraction of light that is absorbed by the material.
What is the reflectivity of a material?
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The fraction of light that is absorbed by the material
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The fraction of light that is reflected by the material
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The fraction of light that is transmitted by the material
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The fraction of light that is scattered by the material
B
Correct answer
Explanation
The reflectivity of a material is a measure of how much light the material reflects. It is defined as the fraction of light that is reflected by the material.
What is the transmissivity of a material?
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The fraction of light that is absorbed by the material
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The fraction of light that is reflected by the material
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The fraction of light that is transmitted by the material
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The fraction of light that is scattered by the material
C
Correct answer
Explanation
The transmissivity of a material is a measure of how much light the material transmits. It is defined as the fraction of light that is transmitted by the material.
What is the scattering cross section of a material?
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The area of a sphere that is equal to the area of the material that scatters light
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The area of a sphere that is equal to the area of the material that absorbs light
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The area of a sphere that is equal to the area of the material that reflects light
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The area of a sphere that is equal to the area of the material that transmits light
A
Correct answer
Explanation
The scattering cross section of a material is a measure of how much light the material scatters. It is defined as the area of a sphere that is equal to the area of the material that scatters light.
What is the absorption cross section of a material?
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The area of a sphere that is equal to the area of the material that scatters light
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The area of a sphere that is equal to the area of the material that absorbs light
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The area of a sphere that is equal to the area of the material that reflects light
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The area of a sphere that is equal to the area of the material that transmits light
B
Correct answer
Explanation
The absorption cross section of a material is a measure of how much light the material absorbs. It is defined as the area of a sphere that is equal to the area of the material that absorbs light.
What is the reflection cross section of a material?
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The area of a sphere that is equal to the area of the material that scatters light
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The area of a sphere that is equal to the area of the material that absorbs light
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The area of a sphere that is equal to the area of the material that reflects light
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The area of a sphere that is equal to the area of the material that transmits light
C
Correct answer
Explanation
The reflection cross section of a material is a measure of how much light the material reflects. It is defined as the area of a sphere that is equal to the area of the material that reflects light.
What is the transmission cross section of a material?
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The area of a sphere that is equal to the area of the material that scatters light
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The area of a sphere that is equal to the area of the material that absorbs light
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The area of a sphere that is equal to the area of the material that reflects light
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The area of a sphere that is equal to the area of the material that transmits light
D
Correct answer
Explanation
The transmission cross section of a material is a measure of how much light the material transmits. It is defined as the area of a sphere that is equal to the area of the material that transmits light.
What is the extinction coefficient of a material?
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The sum of the absorption coefficient and the scattering coefficient
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The difference between the absorption coefficient and the scattering coefficient
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The product of the absorption coefficient and the scattering coefficient
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The quotient of the absorption coefficient and the scattering coefficient
A
Correct answer
Explanation
The extinction coefficient of a material is a measure of how much light the material absorbs and scatters. It is defined as the sum of the absorption coefficient and the scattering coefficient.
What is the scattering efficiency of a material?
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The ratio of the scattering cross section to the geometric cross section
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The ratio of the absorption cross section to the geometric cross section
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The ratio of the reflection cross section to the geometric cross section
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The ratio of the transmission cross section to the geometric cross section
A
Correct answer
Explanation
The scattering efficiency of a material is a measure of how efficiently the material scatters light. It is defined as the ratio of the scattering cross section to the geometric cross section.
What is the term used to describe the efficiency of a light bulb in converting electrical energy into visible light?
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Luminous efficacy
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Power factor
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Color rendering index
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Beam angle
A
Correct answer
Explanation
Luminous efficacy measures the efficiency of a light bulb in converting electrical energy into visible light.
What is the name of the phenomenon that occurs when a gamma-ray burst is followed by a long-lasting emission of optical light?
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A gamma-ray flash
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A gamma-ray burst
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A gamma-ray flare
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A gamma-ray storm
D
Correct answer
Explanation
A gamma-ray storm is a long-lasting emission of optical light that follows a gamma-ray burst. Gamma-ray storms can last for weeks or even months. They are thought to be produced by the interaction of the jet of particles from the gamma-ray burst with the surrounding gas.
What is the name of the phenomenon that occurs when a gamma-ray burst is followed by a long-lasting emission of ultraviolet light?
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A gamma-ray flash
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A gamma-ray burst
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A gamma-ray flare
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A gamma-ray storm
D
Correct answer
Explanation
A gamma-ray storm is a long-lasting emission of ultraviolet light that follows a gamma-ray burst. Gamma-ray storms can last for weeks or even months. They are thought to be produced by the interaction of the jet of particles from the gamma-ray burst with the surrounding gas.
Which of the following is NOT a recommended type of bike light for night cycling?
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Headlight
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Taillight
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Reflective vest
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Flashlight
D
Correct answer
Explanation
Flashlights are not recommended for night cycling as they are not as bright or visible as bike lights specifically designed for cycling.