NEET Physics Mirrors MCQ Question with Solution

If an object is placed 30 cm in front of a concave mirror and the image is formed at a distance of 60 cm from the mirror, what is the focal length of the mirror?

A

20 cm

B

10 cm

C

30 cm

D

15 cm

Correct Answer

Option A

Detailed Explanation

Using the mirror equation $\frac{1}{f} = \frac{1}{v} + \frac{1}{u}$ with $v = -60$ cm and $u = -30$ cm, the focal length $f$ can be calculated as $20$ cm.

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