Optics Question 929

Question: An object is placed at $ 20cm $ from a convex mirror of focal length $ 10cm. $ The image formed by the mirror is

[JIPMER 1999]

Options:

A) Real and at $ 20cm $ from the mirror

B) Virtual and at $ 20cm $ from the mirror

C) Virtual and at $ 20/3cm $ from the mirror

D) Real and at $ 20/3cm $ from the mirror

Show Answer

Answer:

Correct Answer: C

Solution:

$ u=-20cm, $

$ f=+10cm $ also $ \frac{1}{f}=\frac{1}{v}+\frac{1}{u} $

$ \Rightarrow \frac{1}{+10}=\frac{1}{v}+\frac{1}{(-20)}\Rightarrow v=\frac{20}{3}cm; $ virtual image.



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