Optics Question 936

Question: An object of length 6 cm is placed on the principle axis of a concave mirror of focal length f at a distance of 4f. The length of the image will be

[MP PET 2003]

Options:

A) 2 cm

B) 12 cm

C) 4 cm

D) 1.2 cm

Show Answer

Answer:

Correct Answer: A

Solution:

$ \frac{I}{O}=\frac{f}{f-u} $

$ \Rightarrow \frac{I}{+6}=\frac{-f}{-f-(-4f)} $

$ \Rightarrow I=-2cm. $



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