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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 u
Angular magnification of a simple microscope is given by,

m=Du

Here, D is the least distance of distinct vision.


From Len's equation,

1f=1v1u

1f=1D1u

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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