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Angle of incidence of a ray with a mirror is $30 °$ . What will be the angle of reflection with its normal?

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30 °

40 °

60 °

None of these

answer is C.

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Detailed Solution

If the angle of incidence is

30 °

, then the angle of reflection with its normal is

60 °

.
When the light gets reflected through the plane surface, the angle of incidence is equal to the angle of reflection with respect to normal. In this case, incident light is making

30 °

with the mirror, which means it will make

60 °

with normal because the angle between normal and mirror surface is a right angle.

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