PHYSICS [3 Mark Question Answer]

Transparent Medium allows most of the light energy to pass through it. For example glass, air, vacuum, diamond.
Translucent Medium partially allows the light energy to pass through it. For example, ground glass, muddy water, smoke, dust-filled air, butter paper.
Opaque Bodies do not allow light energy to pass through them. For example, bricks, stones, wood and articles made from it, wool .

Anything which allows light energy to pass through it is called an optical medium. Glass, diamond, and vacuum are some examples of mediums through which light can travel.
Kinds of optical medium:
Homogenous Medium: An optical medium which has a uniform composition throughout, is called a homogenous medium. For example, glass diamond, distilled water, a sheet of clear plastic, vacuum, pure alcohol.
Heterogeneous Medium: An optical medium which has different compositions at different points, is called a heterogeneous medium. For example, air, muddy water, fog, mist, clouds, smoke, etc.

Define light energy and then explain it clearly :
Light is an invisible energy, which causes us the sense of vision.
If you enter a dark room, the objects present in the room are not visible.
However, if you switch on a bulb everything in the room becomes visible.
It is because of light.