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If the reflected ray is at an angle of $90 0$ to the incident ray, the angle of incidence of a ray is

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900

450

600

1800

answer is B.

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Detailed Solution

If the reflected ray is at an angle of

90 0

to the incident ray, the angle of incidence of a ray is

45

0
According to the law of reflection, the angle of reflection is always equal to the angle of incidence. If i is the angle of incident and r is angle of reflection then,
According to the law of reflection,

Angle of incidence = Angle of reflection

= > ∠ i = ∠ r

Here reflected ray is at an angle of 900 to the incident ray since

∠ i = ∠ r

45^{0}

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