Question

classify the objects or materials given below as opaque, transparent or translucent or non - luminous.
Air, water , a piece of rock , a sheet of polythene, CD, smoke , a paper , a sheet , of cardboard ,an umbrella, a wall , fog , moon
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Answer 1

Answer:

Opaque = rock , cd , paper , cardboard , umbrella , wall , moon .

Transparent = air , water , smoke , fog .

Translucent = polythene .

Non luminious = all