A light ray gets reflected from a pair of mutually perpendicular mirrors, not necessarily along axes. The intersection point of mirrors is at origin. The incident light is along $y = x + 2$ . If the light ray strikes both mirrors in succession, then it may get reflected finally along the line:

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Two reflections from perpendicular mirrors reverse the ray direction. The final ray is parallel to the incident line y = x + 2 , so its slope is 1. Only (D) has slope 1. Ans. (D)

Physics - Geometrical Optics Question with Solution | TestHub

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