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Two plane mirrors M1 and M2 of length d ...

Two plane mirrors M1 and M2 of length d each are placed at right angle as shown. A point object O is placed symmetrically with respect to the mirrors at co-ordinates `((d)/(2),(d)/(2))`
(a) How many images of O will be seen?
(b) Show that all the images lie on a circle.
(c) Length `l (= OA_(1) = OA_(2))` of both the mirrors is cut and removed. Find least value of l such that only two images of the object are formed.

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