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Q.

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

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a

3.5 ; 2.5

b

2.5 ; 3.5

c

2.5 ; 1.5

d

1.5 ; 2.5

answer is A.

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Detailed Solution

Image is at near point
$m = 1 + \frac{D}{f} = 1 + \frac{25}{10} = 3.5$
Image is at $\infty; m = \frac{D}{f} = \frac{25}{10} = 2.5$

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