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Q.

An object 3 cm tall is placed on the principal axis of a concave mirror of focal length 9 cm at a distance of 12 cm form it. What is the nature and size of the image?

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a

real, 9 cm

b

virtual, 9 cm

c

real, 1 cm

d

virtual, 1 cm.

answer is A.

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Detailed Solution

m=-9-9--12=-93  or  m=-3 or   IO=-3  or  I=-3×3 cm or I=-9 cm The negative sign indicates that the image is real.
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