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Q.

An object of length 6 cm is placed on the principal axis of a concave mirror of focal length f at a distance of 4f. The length of the image will be

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a

2 cm

b

12 cm

c

4 cm

d

1.2 cm

answer is A.

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Detailed Solution

IO=ff−u⇒I+6=−f−f−(−4f)⇒I=−2cm
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