A boy of height 1 m stands in front of a convex mirror. His distance from the mirror is equal to its focal length. The height of his image is (in cm):- (Assume paraxial ray approximation holds)
Options

Question

A boy of height 1 m stands in front of a convex mirror. His distance from the mirror is equal to its focal length. The height of his image is (in cm):- (Assume paraxial ray approximation holds)

G1 Physics · Accepted Answer

Derived solution: Step 1: Use the spherical-mirror relation 1/f = 1/v + 1/u with m = - v/u and R = 2f, following the Cartesian sign convention. Step 2: Substitute the values given in the question and apply the geometry/sign convention shown. Step 3: On simplification the result is 50. Therefore the correct option is A.