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Simple Microscope Angular Magnification

A concave len...

Question

A concave lens of focal length 5 cm is used as a simple microscope. The image is formed at the least distance of distinct vision. Calculate the angular magnification.

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Solution

Angluar magnification $m = 1 + \frac{l e a s t d i s t a n c e o f d i s t a n t v i s i o n}{5}$
least distance of distinct vision=25cm
$m = 1 + \frac{25}{5} = 6$

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