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Question

# An object is to be seen through a simple microscope of focal length 10 cm. Where should the object be placed to produce maximum angular magnification? (The least distance for clear vision is 30 cm).

A
8.5 cm
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B
7.5 cm
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C
6.5 cm
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D
9.5 cm
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Solution

## The correct option is B 7.5 cmGiven, D=30 cm and f=10 cm For maximum angular magnification, the image should be formed at least distance of clear vision. ⇒v=−D=−30 cm Using lens formula, 1f=1v−1u ⇒110=1−30−1u ⇒1u=−130−110=−430 ∴u=−7.5 cm So, the object should be place at 7.5 cm from the lens. Hence, (B) is the correct asnwer.

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