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The magnifications for two positions of ...

The magnifications for two positions of image of the same lens are 3 and 2, of a fix point object on a fix screen when the distance between the two positions of lens is 30 cm .
The focal lengths of the lens is

A

30 cm

B

20 cm

C

10 cm

D

15 cm

Text Solution

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The correct Answer is:
A
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