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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 20/3cm from the mirror

b

Real and at 20cm from the mirror

c

Virtual and at 20cm from the mirror

d

Virtual and at 20/3cm from the mirror

answer is C.

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Detailed Solution

f=+10cmu=20cm

1f=1u+1v

1v=1f1u

=110120

=110+120

=2+120=320

v=203cm virtual & erect

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