Physics
Assertion (A): If the angles of the base of a prism are equal, then in the position of minimum deviation, the refracted ray will pass parallely to the base of the prism.
Reason (R): For minimum deviation, angle of incidence is equal to the angle of emergence.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true and R is not the correct explanation of A.
- assertion is false but reason is true.
- assertion is true but reason is false.
Answer
Both A and R are true and R is the correct explanation of A.
Explanation
Assertion (A) is true. If the angles of the base of a prism are equal, then at minimum deviation condition for prism the angle of incidence is equal to the angle of emergence and the refracted ray inside the prism is parallel to the base of the prism
Reason (R) is true. For the minimum deviation to occur, the angle of incidence must be equal to the angle of emergence. This ensures that the deviation caused by the prism is minimized.
Related Questions
Assertion (A): When a ray of light is refracted through a rectangular glass slab, there is no dispersion of light.
Reason (R): Dispersion of light is the phenomenon of splitting of white light into its constituent colours.
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- Both A and R are true and R is not the correct explanation of A.
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Reason (R): The speed of light outside the prism is same as the speed of light inside the prism.
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Assertion (A): The stars twinkle while the planets do not.
Reason (R): Stars are more distant than the planets.
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Reason (R): The substance in water appears silvery due to refraction of light.
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