IIT-JEE 2007 · Paper 1 · Physics Q12

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PhysicsAssertion and reason+3 / -1Question 12 of 66

STATEMENT-1: The formula connecting $u$ , $v$ and $f$ for a spherical mirror is valid only for mirrors whose sizes are very small compared to their radii of curvature.

because

STATEMENT-2: Laws of reflection are strictly valid for plane surfaces, but not for large spherical surfaces.

Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1

Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1

Statement-1 is True, Statement-2 is False

Statement-1 is False, Statement-2 is True

Answer and worked solution

Official answer: C

Statement 1. The mirror formula assumes paraxial rays, so it holds only for mirrors small compared with their radius of curvature (small aperture). True.

Statement 2. The laws of reflection hold exactly at every point of any surface, curved or not. False.

(C)

Topics:Spherical mirrors Reflection and plane mirrors

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IIT-JEE 2007 · Paper 1, Physics question 12