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Question

# When an object is placed 20 cm from a complex lens then a real image is formed 30 cm from the lens. Where should the object be placed so that a real image of the same size is formed by the lens.

A
Object should be placed 24 cm from the lens.
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B
Object should be placed 34 cm from the lens.
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C
Object should be placed 14 cm from the lens.
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D
Object should be placed 30 cm from the lens.
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Solution

## The correct option is A Object should be placed 24 cm from the lens.1v−1u=1f⟹130−1−20On solving we get f=12cmNow m=−1vu=−1, v=−u112=1−u−1u=−2uu=−24cm Object should be placed 24 cm from the lens.

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