Optics Question 621

Question: The plane surface of a plano-convex lens of focal length f is silvered. It will behave as

[MP PMT/PET 1998]

Options:

A) Plane mirror

B) Convex mirror of focal length 2 f

C) Concave mirror of focal length f/2

D) None of the above

Show Answer

Answer:

Correct Answer: C

Solution:

Focal length of effective lens 1F=2fl+1fm=2fl+1F=fl2



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