Relative Motion of Object, Image, and Plane Mirror – Rankers Physics

Reflection by Plane Mirror: Practice Problem & Solution

Assertion (A): If there is relative motion between a point object & a plane mirror then there must be relative motion between object and image formed by mirror. Reason (R): If the gap between object and mirror will change, the gap between object and image remains same.  
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(A) is true but (R) is false
Both (A) and (R) are false

Short Solution (Best for NEET):

To solve this problem, we apply the core principles of Reflection by Plane Mirror. Understanding the underlying formula is key to arriving at the correct answer below:

Assertion A is true because if the object moves relative to the mirror, its image also moves, causing relative motion between object and image. Reason R is false because for a plane mirror, the object-image gap is twice the object-mirror gap, so if the object-mirror gap changes, the object-image gap also changes.

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