Optics Question 610

Question: A plano convex lens $ (f=20cm) $ is silvered at plane surface. Now f will be

[BHU 1995; DPMT 2001; MP PMT 2005]

Options:

A) 20 cm

B) 40 cm

C) 30 cm

D) 10 cm

Show Answer

Answer:

Correct Answer: D

Solution:

$ \frac{1}{F}=\frac{2}{f _{l}}+\frac{1}{f _{m}} $

$ \Rightarrow $ $ \frac{1}{F}=\frac{2}{20}+\frac{1}{\infty }\Rightarrow F=10 $ $ cm $



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