Question:
Under what condition in an arrangement of two plane mirror incident ray and reflected ray will always be parallel whatever may be the angle of incidence
Answer:
The incident and reflected rays are always parallel to each other when the mirrors are placed perpendicular to each other.
The Ray 1 is incident at a certain angle and its reflected ray is parallel to it. Similarly, Ray 2 is incident at certain other angle, but its reflected ray is parallel too.
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