Question

Classify the objects or materials given below as opaque, transparent or translucent and luminous or non-luminous.

Air, water, rock, a sheet of aluminium, a mirror, a wooden board, smoke, a sheet of plane glass, fog, , a wall, a sheet of carbon paper, the flame of a gas burner, a sheet of cardboard, a lighted torch, a sheet of cellophane, sun, firefly, moon.

Answer 1

Answer:

opaque- rock, a sheet of aluminium ,mirror , wooden board , wall , cardboard ,carbon paper

transparent- air , water , glass , cellophane

translucent-smoke ,fog ,

luminous-flame of gas burner ,  lighted torch , sun , firefly

non-luminous- moon