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1. Image Formation by Mirrors: An object is placed at a distance of 100 cm in...

1. Image Formation by Mirrors:

An object is placed at a distance of 100 cm in front of a convex mirror. A plane mirror is placed at a distance of 40 cm from the convex mirror on the same side as the object. Find the focal length of the convex mirror if the images formed by the two mirrors coincide.                       

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