Two mirrors are perpendicular to each other. The angle of incidence of a light ray with one mirror is 60°. What will the angle of reflection of the ray of light by the second mirror?
Answers
Answer:
as angle of reflection =angle of incidence
answer is 60degree
The angle of reflection of the ray of light by the second mirror will be 30°.
Given:
Two mirrors are perpendicular to each other.
The angle of incidence of light with one mirror is 60°.
To Find:
The angle of reflection of the ray of light by the second mirror =?
Solution:
To answer the above question, we need to know the laws of the reflection of light from mirrors.
There are three primary Laws of Reflection of Light which are stated below,
Law 1: When light is an incident on a mirror the angle made by the incident ray with the normal and angle made by the reflected ray with the normal is the same.
Law 2: The incident ray, reflected ray, and the normal to the surface of the mirror lies in the same plane.
Law 3: The incident ray and the reflected ray lie on the opposite side of the normal.
Now, Applying the above rules, we will first draw an approximate ray diagram consisting of the ray of light and two mirrors perpendicular to each other.
When we apply the property of a triangle,
i.e., The sum of all internal angles of a triangle is equal to 180°.
We can get that the ray incident on the first mirror at an angle of 60° will reflect at the same angle and will incident on the second mirror at an angle of 30° by using the property of the triangle.
And, since the angle of incidence is equal to the angle of reflection;
We can say that the ray of light reflects from the second mirror at an angle of 30°.
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