What will be the angle of reflection if a ray of light strikes the mirror normally?

180^{\circ}

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90^{\circ}

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0^{\circ}

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None of these

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Solution

The correct option is C $0^{\circ}$
For normal incidence,
Angle of incidence = $0^{\circ}$
From $2^{n d}$ law of reflection,
Angle of reflection = Angle of incidence
Therefore, here the angle of reflection = $0^{\circ}$

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