Chapter light class 7th ncert

Light

A form of energy that travels in straight lines and can be seen by the human eye.

Beam of Light

A narrow stream of light that travels in a straight line.

Reflection of Light

The change in direction of light when it hits a surface.

Plane Mirror

A mirror with a flat reflecting surface that produces virtual images.

Concave Mirror

A mirror with a curved inward surface that can form real and virtual images.

Convex Mirror

A mirror with a curved outward surface that always forms virtual images smaller than the object.

Virtual Image

An image that cannot be projected on a screen because it appears to be behind the mirror.

Real Image

An image that can be projected on a screen; it is formed by converging light rays.

Erect Image

An image that appears upright and has the same orientation as the object.

Spherical Mirror

A mirror shaped like a part of a sphere and classified as concave or convex.

Magnifying Glass

A type of convex lens used to make objects appear larger.

Prism

A transparent optical element that refracts light, splitting it into its component colors.

Rainbow

A spectrum of light appearing in the sky, caused by refraction, dispersion, and reflection of sunlight.

Newton’s Disc

A disc divided into segments of different colors that appear white when spun quickly.