Rearrange the boxes given below to make a sentence that helps us understand opaque objects:

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 aluminum, 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.

Rearrange the boxes given below to make a sentence that helps us understand opaque objects:

Correct the following statements.

(i) The color of the shadow of an object depends on its colour of the object.

(ii) Transparent objects allow light to pass through them partially.

You are given a transparent glass sheet. Suggest any two ways to make it translucent without breaking it.

Is air around us always transparent? Discuss.

Observe the picture given in Fig. 11.6. A sheet of some material is placed at position ‘P’, still the patch of light is obtained on the screen. What is the type of material of this sheet?