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(a) The magnification of a concave mirror is - 1. What is the position of the object? (b) The magnification of a spherical mirror is `+-`2. What kind of mirror can it be?

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(a) The object must be at the centre of curvature of concave mirror. The image formed is real, inverted and of the same size as the object. That is why magnification = - 1.
(b) The mirror must be a concave mirror. Only then magnification can be positive or negative.

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