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Anonymous:
soooooooo easy
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2
0 degreee...............
If light falls perpendicular to the surface of mirror, that is the angle of incidence is zero degrees then the angle of reflection is also zero. Hence the light ray will retrace its path.

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If light falls perpendicular to the surface of mirror, that is the angle of incidence is zero degrees then the angle of reflection is also zero. Hence the light ray will retrace its path.

HOPE it's HELP you
MARK ME AS BRAINLIST
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1
When the ray falls normally on a surface !
⇒ The ray passes to the second medium undeviated
⇒ There is no reflection at all.
⇒ Hence the angle of reflection is 0°
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Option D
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