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Remember that the angle of incidence must equal the angle of reflection. This means that the light will turn through twice the angle of incidence, or to put it another way, the angle of incidence must be half the angle through which the light turns.

You want an angle of turning of 90 degrees, so make sure that the angle is half of ninety degrees. In other words, let the light strike the mirror at an angle of 45 degrees.

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