Class 10 Science Chapter 9: Light: Reflection and Refraction Assertion-reason questions with answers
2 assertion-reason questions on Light: Reflection and Refraction, each with its answer and the reason, written from the NCERT chapter. Open a question's solution to check your working; then take the free test to find your next chapter. Each question gives an Assertion (A) and a Reason (R); choose how they stand to each other.
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Answer: (a) Both A and R are true, and R is the correct explanation of A.
n = c/v, so a higher refractive index means a lower speed. Crown glass (1.52) has a higher refractive index than water (1.33), so light is slower in glass and faster in water. R explains A.
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Answer: (b) Both A and R are true, but R is not the correct explanation of A.
Both statements are true. A convex mirror is chosen because it always gives an erect, diminished image with a wider field of view; the sign of its focal length is only a convention and does not explain the choice.
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