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An object of size 7 cm is placed at 27 c...

An object of size 7 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen by placed to obtain a sharp image ? Find size and nature of the image.

A

-54 cm

B

54 m

C

54 cm

D

-54 cm

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