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Q.

An object 25 cm high is placed infront of a convex lens of focal length 30 cm. If the height of real image formed is 50 cm. Find distance between object and image

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a

90 cm

b

45 cm

c

30 cm

d

135 cm

answer is D.

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Detailed Solution

size of imagesize of object=Vu and 1V−1u=1f

here v=2u

solving for u =45 then v=45 u+v=135 cm

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