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Image Formation by Convex Lens

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Question

of 15.3 cm on an optical bench. To get a clear image of a distant tree, he adjusted a screen and
finally got clear image when screen was placed at 32.5 cm. Focal length of the lens is - a,32.5 b,17.2 c,34.4 d,47.8

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Solution

The focal length of the lens is ,
f = 32.5 - 15.3 = 17.2 cm

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