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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.........

Asked by Anushka(student) , on 24/3/13


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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

Posted by Aayushi Pandey(student)on 24/3/13

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