Classifications: 1 Mark each
On the basis of the amount of light they let through them, materials are classified into three: transparent, translucent and opaque.
Transparent materials are those which let light pass through them completely. Examples include glass and water.
Translucent materials only partially let light pass through them. The rest of the light is reflected away. Examples: frosted glass, tracing paper.
Opaque materials do not let any light pass through them. All the light is reflected from the material. Examples: Wood, iron, etc.