Laws of reflection

Laws of reflection of light class 12: definition, statement, explanation with diagrams

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Laws of reflection of light class 12

Laws of reflection of light class 12: definition, explanation with diagrams

In this article, we will discuss in detail what are the laws of reflection of light class 12, definition, statement, and it’s explanation.

Previously we have discussed the Reflection and its type viz., diffuse reflection and specular reflection. If you don’t know about them you should read this.

There are two laws of reflection:
1. First law of reflection
2. Second law of reflection

But before we understand the laws, we need to know some basic terms which would help us understand the laws better. You can jump to the laws of reflection if you already know these terms.

Some basic terminologies

Incident ray

The Ray of light that falls on the surface is called an incident ray. The left Ray in the diagram is the incident ray.

Reflected ray

The Ray of light which bounces back after colliding with the surface is called a reflected ray.

Normal ray

The line which is perpendicular to the surface, at the point of reflection is called a Normal ray. The normal ray makes an angle of 90 degrees with the surface at the point of reflection.

Angle of Incidence

The angle between the incident ray and Normal ray is called the Angle of Incidence.

Angle of Reflection

The angle between the normal ray and the reflected ray is called the Angle of reflection.

Since you are familiar with the basic terminologies of reflection, now we will discuss the Laws.

First law of reflection

Laws of reflection of light class 12: definition, explanation with diagrams
Fig. 1: Laws of reflection

The first Law of reflection states that the angle of incidence is equal to the angle of reflection.

For example, if an incident ray makes and angle of 45 degrees with the normal ray (line perpendicular to the surface at the point). The reflected ray would also make the angle of 45 degrees with the normal ray.

Second law of reflection

The incident ray, normal ray, and reflected ray all lie in the same plane.

images 1 Laws of reflection of light class 12
Fig.3 all rays are in same plane( source :https://www.a-levelphysicstutor.com)

As you can see in the above figure the incident ray, normal ray and the reflected ray all lie in the same plane or surface. Stay tuned with Laws Of Nature for more useful and interesting content.

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