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Question

An object of 5 cm is kept at a distance of 25 cm from concave lens of focal length 10 cm. Calculate the distance of the image from the lens and size of the image.

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Solution

Given : u=25 cm f=10 cm ho=5 cm
Using 1v1u=1f
Or 1v1(25)=1(10)
v=7.14 cm
Height of image hiho=vu
Or hi5=7.1425
hi=1.43

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