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An object is placed 20 cm from the surface of a convex mirror and a...

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An object is placed 20 cm from the surface of a convex mirror and a plane mirror is set so that virtual images formed by two mirrors coincide If plane mirror is at a distance of 12 cm from object then the focal length of convex mirror is 1 5 cm 2 10 cm 3 20 cm 4 40 cm

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