Summary

Light is a form of energy that aids vision.

There are two main sources of light. They are; natural sources and artificial sources.

Luminous bodies produce their own light. Non luminous bodies do not produce their own light.

A ray of light is the straight path of light in any uniform medium. A beam of light is a set of light rays traveling together.

Pinhole camera works on the principle of rectilinear propagation of light.

A shadow is the area of darkness cast on a screen by an opaque object placed between a source of light and the screen. There are two types of eclipse. They are eclipse of the sun (solar eclipse) and eclipse of the moon (lunar eclipse).