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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

1f=1v+1u

1+10=1v+1(-20)v=203 cm; virtual image. 

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