Physics, asked by SunandaMukherjee, 1 year ago

The image of an object formed by a lens is -1 .If the distance between the object and the image is 60m then find its focal length.If the object is moved 20 cm towards the lens , where the image will be formed.State reasons.

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Answered by vishalgajranideepak

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SunandaMukherjee: sorry,but this is wrong ...focus will be 15 cm.

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