Question 2
Classify the objects or materials given below as opaque, transparent or translucent and luminous or non-luminous:
Air, water, a piece of rock, a sheet of aluminium, a mirror, a wooden board, a sheet of polythene, a CD, smoke, a sheet of plane glass, fog, a piece of red-hot iron, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon paper, the flame of a gas burner, a sheet of cardboard, a lighted torch, a sheet of cellophane, a wire mesh, kerosene stove, sun, Firefly, moon.
Question 2
Classify the objects or materials given below as opaque, transparent or translucent and luminous or non-luminous:
Air, water, a piece of rock, a sheet of aluminium, a mirror, a wooden board, a sheet of polythene, a CD, smoke, a sheet of plane glass, fog, a piece of red-hot iron, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon paper, the flame of a gas burner, a sheet of cardboard, a lighted torch, a sheet of cellophane, a wire mesh, kerosene stove, sun, Firefly, moon.
Opaque objects: Objects that do not allow light to pass through them are called opaque objects.
Example: A piece of rock, a sheet of aluminium, a mirror, a wooden board, a CD, a piece of red-hot iron, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon paper, the flame of a gas burner, a sheet of cardboard, a lighted torch, kerosene stove, sun, Firefly, moon.
Transparent objects: Objects that allow light to completely pass through them are called transparent objects.
Example: Air, water.
Translucent objects: Objects that allow light to pass through them partially are called translucent objects.
Example: A sheet of polythene, smoke, a sheet of plane glass, fog, a sheet of cellophane, a wire mesh.
Luminous objects: Objects that give out or emit light of their own are called luminous objects.
Example: A piece of red-hot iron, a lighted fluorescent tube, the flame of a gas burner, a lighted torch, sun, Firefly.
Non - luminous objects: Objects that do not emit light of their own are called non-luminous objects.
Examples: Air, water, a piece of rock, a sheet of aluminium, a mirror, a wooden board, a sheet of polythene, a CD, smoke, a sheet of plane glass, fog, an umbrella, a wall, a sheet of carbon paper, a sheet of cardboard, a sheet of cellophane, a wire mesh, kerosene stove, moon.
Opaque objects: Objects that do not allow light to pass through them are called opaque objects.
Example: A piece of rock, a sheet of aluminium, a mirror, a wooden board, a CD, a piece of red-hot iron, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon paper, the flame of a gas burner, a sheet of cardboard, a lighted torch, kerosene stove, sun, Firefly, moon.
Transparent objects: Objects that allow light to completely pass through them are called transparent objects.
Example: Air, water.
Translucent objects: Objects that allow light to pass through them partially are called translucent objects.
Example: A sheet of polythene, smoke, a sheet of plane glass, fog, a sheet of cellophane, a wire mesh.
Luminous objects: Objects that give out or emit light of their own are called luminous objects.
Example: A piece of red-hot iron, a lighted fluorescent tube, the flame of a gas burner, a lighted torch, sun, Firefly.
Non - luminous objects: Objects that do not emit light of their own are called non-luminous objects.
Examples: Air, water, a piece of rock, a sheet of aluminium, a mirror, a wooden board, a sheet of polythene, a CD, smoke, a sheet of plane glass, fog, an umbrella, a wall, a sheet of carbon paper, a sheet of cardboard, a sheet of cellophane, a wire mesh, kerosene stove, moon.
