There is a point object and a plane mirror. If the mirror is moved by 2 cm away from the object find the distance (in cm) which the image will move.
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Question

There is a point object and a plane mirror. If the mirror is moved by 2 cm away from the object find the distance (in cm) which the image will move.

G1 Physics · Accepted Answer

Derived solution: Step 1: Use the law of reflection i = r and plane-mirror symmetry. The image is as far behind the mirror as the object is in front; rotation of a mirror by φ rotates the reflected ray by 2φ. Step 2: Substitute the values given in the question and apply the geometry/sign convention shown. Step 3: On simplification the result is 4. Therefore the correct option is A.