Q. In a double-slit experiment, what causes the interference pattern?
-
A.
Reflection
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B.
Refraction
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C.
Diffraction
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D.
Interference
Solution
The interference pattern is caused by the superposition of light waves from the two slits.
Correct Answer:
D
— Interference
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Q. What happens to the speed of light when it passes from air into water?
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A.
It increases
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B.
It decreases
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C.
It remains the same
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D.
It becomes zero
Solution
The speed of light decreases when it passes from air into water due to the higher refractive index of water.
Correct Answer:
B
— It decreases
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Q. What is the critical angle for total internal reflection?
-
A.
sin(θc) = n2/n1
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B.
sin(θc) = n1/n2
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C.
θc = n1/n2
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D.
θc = n2/n1
Solution
The critical angle θc can be calculated using sin(θc) = n2/n1, where n1 is the refractive index of the medium where the light is coming from.
Correct Answer:
A
— sin(θc) = n2/n1
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Q. What is the effect of increasing the temperature on the speed of sound in air?
-
A.
It decreases
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B.
It increases
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C.
It remains the same
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D.
It becomes zero
Solution
The speed of sound in air increases with an increase in temperature.
Correct Answer:
B
— It increases
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Q. What is the formula for calculating the focal length of a lens?
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A.
1/f = 1/v + 1/u
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B.
f = v + u
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C.
f = v - u
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D.
1/f = v - u
Solution
The lens formula is given by 1/f = 1/v + 1/u, where f is the focal length, v is the image distance, and u is the object distance.
Correct Answer:
A
— 1/f = 1/v + 1/u
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Q. What is the principle behind the operation of a convex lens?
-
A.
It diverges light rays
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B.
It converges light rays
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C.
It reflects light rays
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D.
It absorbs light rays
Solution
A convex lens converges light rays that are incident on it.
Correct Answer:
B
— It converges light rays
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Q. What is the unit of power in optics?
-
A.
Joule
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B.
Watt
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C.
Newton
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D.
Lumen
Solution
The unit of power in optics, as in all physics, is the Watt (W), which is equivalent to Joules per second.
Correct Answer:
B
— Watt
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Q. What type of lens is used to correct nearsightedness?
-
A.
Convex lens
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B.
Concave lens
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C.
Bifocal lens
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D.
Cylindrical lens
Solution
A concave lens is used to correct nearsightedness (myopia) by diverging light rays before they enter the eye.
Correct Answer:
B
— Concave lens
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Q. Which phenomenon explains the bending of light when it passes through a prism?
-
A.
Reflection
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B.
Refraction
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C.
Diffraction
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D.
Interference
Solution
Refraction is the phenomenon that explains the bending of light as it passes through different media, such as a prism.
Correct Answer:
B
— Refraction
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