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प्रश्न
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 diagram.
उत्तर
When the two plane mirrors are perpendicular to each other, the incident ray and the reflected ray will always be parallel to each other, whatever may be angle of incidence. The same can be seen in the below diagram :
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