Two Plane Mirrors Are a Distance 2d Apart and Parallel

question 88

Multiple Choice

Two plane mirrors are a distance 2d apart and parallel to one another. An object is placed at the midpoint between the two mirrors. After two reflections on each mirror, how far will be the image from the mirror with the last, i.e., the fourth, reflection?

• A) d
• B) 3d
• C) 5d
• D) 7d
• E) 9d

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