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Q 9.20 A screen is placed 90cm from an object. The image of the object on the screen is formed by a convex lens at two different locations separated by 20cm. Determine the focal length of the lens.
Answers (1)
As we know that the relation between focal length , the distance between screen
and distance between two locations of the object
is :
Given: = 90 cm.,
= 20 cm ,
so
Hence the focal length of the convex lens is 21.39 cm.
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