A point object is placed at a distance of 30 cm from a convex mirror of focal length 30cm. The image will form at
A
Infinity
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B
15 cm infront of the mirror
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C
20 cm infront of the mirror
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D
15 cm behind the mirror
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Solution
The correct option is D 15 cm behind the mirror Given, object distance, u=−30cm and focal length, f=+30cm. Let image distance be v Using mirror formula 1f=1v+1u⇒1+30=1v+1(−30) On solving we get, v=15cm, behind the mirror