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+1 vote
30.8k views
in Physics by (130k points)

A screen is placed 90 cm from an object. The image of the object on the screen is formed by a convex lens at two different locations separated by 20 cm. Determine the focal length of the lens.

1 Answer

+2 votes
by (93.8k points)
edited by
 
Best answer

Distance between the image (screen) and the object, D = 90 cm

 Distance between two locations of the convex lens, d = 20 cm 

Focal length of the lens = f 

Focal length is related to d and D as:

Therefore, the focal length of the convex lens is 21.39 cm.

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