What is the angle of incidence if a ray is reflected by a plane mirror back along its original path?
$0^{\circ}$
$90^{\circ}$
$45^{\circ}$
$30^{\circ}$

30^{\circ}

90^{\circ}

45^{\circ}

0^{\circ}

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What is the angle of incidence if a ray is reflected by a plane mirror back along its original path?
$0^{\circ}$
$90^{\circ}$
$45^{\circ}$
$30^{\circ}$