Class 8 Physics Light Laws of Reflection

Laws of Reflection

Before we study the Laws of Reflection, let us understand some basic terminologies

Definitions:

Ray of Light: A single thin light along a line. A ray of light is hypothetical. It is an ideal scenario. In reality, we have many rays which make a beam of light.

Incident Ray: The light ray, which strikes any surface, is called the incident ray.

Reflected Ray: The ray that comes back from the surface after reflection is known as the reflected ray.

Normal: A line drawn perpendicular to the line representing the mirror at the point where the incident ray strikes the mirror.

Angle of incidence: The angle between the normal and the incident ray is called the angle of incidence. It is denoted as i.

Angle of reflection: The angle between the normal and the reflected ray is called the angle of reflection. It is denoted as r.

Laws of Reflection

Law 1 : The incident ray, the normal at the point of incidence and the reflected ray all lie in the same plane.

Law 2 : Angle of incidence is equal to the angle of reflection

Law 3 or Law of Lateral Inversion: In a image formed by a mirror, the left of the object appears to be the right and the right of the object appears to be the right. (Stand in front of the mirror and lift your right hand. In the mirror, it appears like you have lifted the left hand and viceversa)

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