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Q.

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

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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

answer is C.

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Detailed Solution

$u = - 20 cm, f = + 10 cm$

$\frac{1}{f} = \frac{1}{v} + \frac{1}{u}$

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

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