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Two plane mirrors are joined together as...

Two plane mirrors are joined together as shown. Two point objects A and B are placed symmetrically such that `OA = OB = d. [AOB` is a straight line]
(a) If the images of A and B coincide find `theta` (call it `theta_(0))`.
(b) Keeping the position of objects unchanged the angle between the two mirrors is increased to `theta = (4)/(3) theta_(0)`. Now find the distance between the images of A and B.

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The correct Answer is:
(a) `theta_(0) = 90^(@)` (b) d
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