Optics Question 939

Question: Image formed by a concave mirror of focal length 6 cm, is 3 times of the object, then the distance of object from mirror is

[RPMT 2000]

Options:

A) - 4 cm

B) 8 cm

C) 6 cm

D) 12 cm

Show Answer

Answer:

Correct Answer: A

Solution:

m = ± 3 and f = ? 6 cm Now $ m=\frac{f}{f-u}\Rightarrow \pm 3=\frac{-6}{-6-u} $

For real image $ -3=\frac{-6}{-6-u} $

Therefore $ u=-8cm $

For virtual image $ 3=\frac{-6}{-6-u} $

Therefore $ u=-4cm $



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