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Two flat mirrors are arranged so the angle between them is 100 degrees, as shown in the diagram (not necessarily drawn to scale). A ray of light is incident upon the first mirror, and then after reflecting, is incident upon the second mirror.

If the ray reflects from the second mirror in the manner shown, what was the original angle of incidence when the ray struck the first mirror?

A

$30^{\circ}$

B

$40^{\circ}$

C

$50^{\circ}$

D

$60^{\circ}$

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