Assertion and Reason for Mirror Length and Image Formation – Rankers Physics

Reflection by Plane Mirror: Practice Problem & Solution

Assertion (A): The minimum length of mirror required to form complete image of man of height \(H) is \(H/2\). Reason (R): Image of an object is obtained if incident light ray reaches the reflecting surface.  
(1) Both (A) & (R) are true and the (R) is the correct explanation of the (A)
(2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(3) (A) is true but (R) is false
(4) 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:

The minimum length of a plane mirror to see a full image of a person of height \(H) is \(H/2\). Image formation occurs when light rays reach and reflect from a surface. Both statements are true, but R is a general principle and does not explain the specific \(H/2\) relation.

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