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Question

In a simple microscope, if the final image is located at infinity then its magnifying power is; (D is the least distance for distinct vision in the simple microscope)

A
D/F
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B
1
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C
F/D
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D
(1+D)/F
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Solution

The correct option is A D/F
Given: in a simple microscope, the final image is formed at the infinity.
We know that, least distance for distinct vision in the simple microscope is D=25 cm.
Again we know, when the final image in a simple microscope is formed at infinity, the object must be situated at the focus F.
When the image is at infinity, the magnifying power of the microscope is
M=DF
So, the correct option is (A).

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