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Image Formation in Plane Mirrors

a luminous ob...

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a luminous object is placed 20cm from the surface of a convex mirror and a plane mirror set so that the virtual images formed in the two Mirrors coincide if the plane mirror is at a dis†an ce of 15 cm from the object then focal length of the convex mirror is

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Q. A luminous object is placed 20 cm from surface of a convex mirror and a plane mirror is set so that virtual images formed in two mirrors coincide. If plane mirror is at a distance of 12 cm from object, then focal length of convex mirror is:

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