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Q.

The real image which is exactly equal to the-size of an object is to be obtained on a screen with the help of a convex lens of focal length 15 cm. For this, what must be in the distance between the object and screen? 

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a

45 cm

b

60 cm

c

15 cm

d

30 cm

answer is D.

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Detailed Solution

Keep the object at a distance 2f from the lens then u=v

Hence, distance between object and the screen  d=4 f = 4×15=60 cm

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