Question

The enlarged image of an object placed at 60 cm in front of a lens is obtained on a screen
distance of 120 cm from it.
(i) Focal length of lens will be :
(a) 20 cm
(6) 30 cm
(c) 40 cm
(d) 80 cm​

Answer 1

Answer:

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Answer 2

Answer:

Solution

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, we get <br> using

<br> f = 40 cm <br>

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