A ray of light falls normally on a plane mirror. What is the angle of incidence?

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Solution

The angle between the incident ray and the normal is called the angle of incidence. When a light ray falls normally to a plane mirror the incident ray and normal coincide with each other.
Hence, angle of incidence is $0^{\circ}$ .

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A ray of light falls normally on a plane mirror. What is the angle of incidence?

The angle between the incident ray and the normal is called the angle of incidence. When a light ray falls normally to a plane mirror the incident ray and normal coincide with each other. Hence, angle of incidence is 0∘.

The angle between the incident ray and the normal is called the angle of incidence. When a light ray falls normally to a plane mirror the incident ray and normal coincide with each other.
Hence, angle of incidence is $0^{\circ}$ .