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Under what condition in an arrangement of two plane mirrors, incident ray and reflected ray will always be parallel to each other, whatever may be angle of incidence. Show the same with the help of ray diagram.

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When two plane mirrors are placed at right angle to each other, then the incident and reflected rays will always be parallel to each other.

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The following diagram shows a point object O placed in front of a plane mirror. Take two rays from the point O and show how the image of O is formed and seen by the eye.

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