Chapter : 3. Light Reflection
Propagation of Light
(C) Propagation of Light
Light travels along straight lines in a medium or in vacuum. The path of light changes only when there is an object in its path or where the medium changes. Apart from vacuum and gases, light can travel through some liquids and solids as well.
Transparent medium : A medium in which light can travel freely over large distances is called a transparent medium.
Examples: Water, glycerin, glass and clear plastics are transparent.
Opaque : A medium in which light cannot travel is called opaque.
Examples : Wood, metals, bricks, etc., are opaque.
Translucent : A medium in which light can travel some distance, but its intensity reduces rapidly. Such materials are called translucent.
Examples : Oil
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