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

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

Solution:

Correct answer is (a) 5 cm