Question

If a rays of light incident on a plane mirror is such that it makes an angle 30° with the mirror then the angle of reflection is

Answer 1

ExplanationAccording to the law of reflection, the angle of incidence and angle of reflection are equal. Both these angles are measured with respect to a line normal to the reflection surface. If I understand the question correctly, the incident ray makes an angle of 60 degrees with the mirror surface, then the angle of incidence can be calculated as:

Angle of incidence = 90 - angle made with the mirror surface

Angle of incidence = 90 - angle made with the mirror surface= 90 - 60 = 30 degrees.

Angle of incidence = 90 - angle made with the mirror surface= 90 - 60 = 30 degrees.Since, angle of incidence = angle of reflection = 30 degrees.

Angle of incidence = 90 - angle made with the mirror surface= 90 - 60 = 30 degrees.Since, angle of incidence = angle of reflection = 30 degrees.The incident ray will have an angle of reflection of 30 degrees (made with a surface normal to the mirror surface).

Angle of incidence = 90 - angle made with the mirror surface= 90 - 60 = 30 degrees.Since, angle of incidence = angle of reflection = 30 degrees.The incident ray will have an angle of reflection of 30 degrees (made with a surface normal to the mirror surface).The reflected ray will make an angle of 60 degrees (90 - 30 degrees) with the mirror surface.

Answer 2

Answer:

Concept:

Angle of reflection is defined as the angle formed by the reflected ray and the normal at the angle of intersection to a reflecting surface. According to the law of reflection, the angle of reflection matches the angle of incidence. As a result, the reflection (measured against the normal) is 80 degrees. The angle measured from the reflected ray to the surface normal is the angle of reflection of a ray or beam. The angle of incidence is measured between the ray and a line normal to the surface that crosses the surface at the same location as the ray, according to the law of reflection.

Given:

The angle of reflection is 30° if light rays impacting on a flat mirror produce an angle of 30° with the mirror.

Find:

find the angle of reflection for the given question

Answer:

=> Consider the incident ray, which is a ray of light that strikes a surface. The angle of incidence is the angle at which the incident ray enters the scene. The reflected ray is the ray of light that bounces off the surface, and the angle at which it bounces off the surface is called the angle of reflection. According to the law of reflection, the incidence angle equals the angle of reflection. In this illustration of the law of reflection, the vertical dashed line is parallel (perpendicular) to the surface. The incidence and reflection angles are calculated in relation to the dashed line.

At an angle of a ray  light strikes the mirror is $30$°

It will make athe angle with the normal is $60$° ($90$° - $30$°)

The incidence angle is $=60$°.  

The laws of reflection is

Incidence angle = reflection angle

reflection angle $=60$°.

Hence the reflection angle is $60$°.

∴ the angle of reflection is $60$°

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