Question

what happens when incident ray strikes the reflecting surface normally ?

Answer 1

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HERE IS UR ANSWER



For a plane mirror: If the incident ray falls along the normal, the angle of incidence is 0 degrees, NOT 90 degrees. The angle is measured with the normal to the mirror and not with the plane of the mirror. Hence the angle of reflection is equal to 0 degrees. Please see the image attached for better understanding.

Bonus: For a curved mirror: Finding out the normal of a curved mirror can be tricky. The normal of a curved mirror depends on the point of incidence. A plane, tangential to the curve at that point, is drawn and a normal is drawn at the point of incidence which is perpendicular to the aforementioned plane. The angle of incidence and the angle of reflection is measured with this normal.

Answer 2

Explanation:

The angle between incident and the reflected ray will be 0 degrees. The angle between the incident ray and the mirror is called angle of incidence while the angle between reflected ray and the normal is called angle of reflection. Here, the ray of light is incident normally on a plane mirror .