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Anushka from KENDRIYA VIDYALAYA, asked a question
Subject: Science , asked on 24/3/13

To find the focal length of a convex lens in a laboratory, Aman fixed it on a stand and kept it on a mark of 15.3cm on an optical bench.To get a clear image of a distant tree, he adjusted a screen and finally got the clear image when the screen was placed at 32.5cm. Then Focal length of the lens is.........

Aayushi Pandey From Maharishi Vidya Mandir, added an answer, on 24/3/13
62 helpful votes in Science

focal length = distance b/w the lens and the screen

focal length = 32.5 cm - 15.3 cm

 =  17.2cm

hence the focal length of the lens is 17.2 cm

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Anushka From Kendriya Vidyalaya, added an answer, on 24/3/13
39 helpful votes in Science

thnx   

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