Question 1. Rearrange the boxes given below to make a sentence that helps us understand opaque objects.
solution 1.
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 fame of a gas burner, a sheet of cardboard, a lighted torch, a sheet of cellophane, a wire mesh, kerosene stove, sun, firefly, moon.
solution 11.
Question 3. Can you think of creating a shape that would give a circular shadow if held in one way and a rectangular shadow if held in another way?
Solution 3. Yes, there are many things which give a circular shadow if held in one way and a rectangular shadow if held in another way.
For example a Cylinder, a Circular disc etc.
Question 4. In a completely dark room, if you hold up a mirror in front of you, will you see a reflection of yourself in the mirror?
Solution 4. for reflection light is very important so n a dark room you would not see a reflection of yourself if you hold up a mirror in front of you