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Question

A point object is placed an distance of 30cm from a convex mirror of focal length 30cm. The image will form at :

A
Infinity
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B
Pole
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C
Focus
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D
15cm behind the mirror
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Solution

The correct option is D 15cm behind the mirror
Given, u=30cm ,f=30cm
To find: v

Solution: From mirror formula

1v+1u=1f

1v130=130

1v=230

v=15cm

Hence image is formed behind the mirror.

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