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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 so as 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 f=10 cm Maximum angular magnification is achieved when image is formed at least distance of vision, i.e. v=−30 cm(=D) Using lens formula, 1f=1v−1u ⇒110=1−30−1u ⇒1u=−130−110=−215 u=−7.5 cm Object should be placed at a distance of 7.5 cm from the lens.

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