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Question

# An object is placed at a distance u from a simple microscope of focal length f. The angular magnification obtained depends

A
on f but not on u
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B
on u but not on f
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C
on f as well as u
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D
neither on f nor on u
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Solution

## The correct option is A on f but not on uAngular magnification of a simple microscope is given by, m=Du Here, D is the least distance of distinct vision. From Len's equation, 1f=1v−1u ⇒1f=1−D−1−u ⇒m=Du=1+Df Therefore, angular magnification depends only on f. Hence, (A) is the correct answer. Why this question : Angular magnification depends only on the focal length of the lens.

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