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>> $The focal length of a convex lens is 10$

Question

The focal length of a convex lens is 10 cm. The magnifying powers when it is used as a magnifying glass to form the image at (i) near point and (ii) far point are :

A

2.5, 3.5

B

3.5, 4.5

C

4.5, 3.5

D

3.5, 2.5

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Updated on : 2022-09-05

Solution

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Correct option is D)

For the near point, magnification, $m_{1} = 1 + \frac{D}{f}$

For the far point, $m_{2} = \frac{D}{f}$

Thus, putting $D = 25$ and $f = 10$

We get, $m_{1} = 3.5$ and $m_{2} = 2.5$

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