Optics Question 596

Question: An object is placed at a distance of 20 cm from a convex lens of focal length 10 cm. The image is formed on the other side of the lens at a distance

[CPMT 1971; RPET 2003]

Options:

A) 20 cm

B) 10 cm

C) 40 cm

D) 30 cm

Show Answer

Answer:

Correct Answer: A

Solution:

$ \frac{1}{f}=\frac{1}{v}-\frac{1}{u} $ (Given $ u=-20 $ cm, $ f=10 $ cm, $ v=? $ )

$ \therefore $ $ \frac{1}{10}=\frac{1}{v}-\frac{1}{(-20)}\Rightarrow v=20cm $



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