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Question

Images of an object that is equidistant from the two plane mirrors whose reflecting surfaces make an angle of 90 with one another lie on a/an
  1. straight line
  2. parabola
  3. ellipse
  4. circle


Solution

The correct option is D circle

By applying the concept of object distance = image distance from the plane mirror, we can see that 3 images and the object are symmetrical w.r.t intersection of the mirrors M1 and M2. Therefore, all the 3 images lie on a circle with centre at intersection of the mirrors. 

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