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An incoming ray of light is shown striking a vertical mirror with an incidence angle of ${ 30 }^{ \circ }$ and then reflecting to the upper left. The normal line to the mirror is shown as a green line.

Assuming this is a smooth mirror, what is the reflection angle?

A

${ 30 }^{ \circ }$

B

${ 60 }^{ \circ }$

C

${ 90 }^{ \circ }$

D

${ 0 }^{ \circ }$

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