Topics and Sub Topics in Class 6 Science Chapter 8 Light Shadows and Reflection:
| Section Name | Topic Name |
| 8 | Light, Shadows and Reflections |
| 8.1 | Transparent, opaque and translucent objects |
| 8.2 | What exactly are shadows? |
| 8.3 | A pinhole camera |
| 8.4 | Mirrors and reflections |
Exercise Questions
Q 1. Rearrange the boxes given below to make a sentence that helps us understand opaque objects.
Ans:
Q 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, the moon.
Ans:
Opaque: A piece of rock, a sheet of aluminium, a mirror, a wooden board, a CD, an umbrella, a wall, a sheet of carbon paper, a sheet of cardboard
Transparent: Air, water, and a sheet of plane glass
Translucent: A sheet of polythene, smoke, fog, a sheet of cellophane, and a wire mesh
Luminous: A piece of red hot iron, a lighted fluorescent tube, the flame of a gas burner, a lighted torch, sun, firefly, kerosene stove
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, an umbrella, a wall, a sheet of carbon paper, a sheet of cardboard, a sheet of cellophane, a wire mesh, moon
Q 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?
Ans: Yes, as shown in the image below:
Q 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?
Ans: No, you won't see a reflection of yourself in a completely dark room because there is no light to illuminate your image and create a reflection in the mirror.
Reflection occurs when light bounces off an object and into our eyes or a camera, allowing us to see the object. Without any light present, there would be no reflection.