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Q.

A concave lens of focal length 20 cm placed in contact with a plane mirror acts as a

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a

Convex mirror of focal length 10 cm

b

Concave mirror of focal length 40 cm

c

Concave mirror of focal length 60 cm

d

Concave mirror of focal length 10 cm

answer is A.

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Detailed Solution

1F=2f+1fm. Here fm=∞, hence F=f2=10cm
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