1.

An object O is placed in front of a partially reflecting plane mirror M1 and a concave mirror M2 of focal length f. The distance between O and M1 is x and the distance between M1 and M2 is y. The two images of O formed by partial reflection in M1 and reflection in M2 (of rays passing through M1) coincide. The magnitude of f is(a) (y2 - x2) / 2y(b) (y2 + x2) / 2y(c) y - x(d) y2 + x2) / y - x

Answer»

Correct Answer is: (a) (y2 - x2) / 2y



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