40.A concave lens forms the image of an object such that the distance between the object and the image is 10 cm and magnification produced is 1/4 .fint the focal length of the lens.

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Q. A concave lens forms the image of an object such that the distance between the object and image is

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. The focal length of the lens will be

Q. A concave lens forms the image of an object such that the distance between the object and image is 10 cm and the magnification proceed is

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A concave lens has focal length 15 cm. At what distance should the object from the lens should be placed so that it forms an image at 10 cm from the lens? Also find the magnification produced by the lens.

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