Light and the Formation of Shadows Q & A
Q.1. Choose an appropriate word and fill in the blanks.
(a) A star is a natural source of light.
(b) A candle is an artificial source of light.
(c) When light passes through a prism, it gets separated into seven colours.
(d) The image obtained in the pinhole camera is inverted .
(e) A shadow is formed when an opaque object comes in the way of light.
(f) When a transparent object comes in the way of light, light passes through it.
(options : seven, star, through, transparent, opaque, colors, shape, erect, inverted, luminous, candle)
Q.2. Write whether the following objects are luminous or non-luminous.
Object | Luminous /Non-luminous |
A book | Non-luminous |
A burning candle | Luminous |
A wax cloth | Non-luminous |
A pencil | Non-luminous |
A pen | Non-luminous |
A light bulb | Luminous |
A tyre | Non-luminous |
A torch | Luminous |
Q.3. Match the following.
Group A | Answers |
Mirror | Reflection |
Firefly | Non-luminous |
Pinhole camera | Inverted image |
Moon | Luminous |
Q.4. Write the answers to the following.
(a) What things are necessary for the formation of a shadow?
Ans:The things that are necessary for the formation of a shadow:
- A source of light
- An object
- A surface or screen on which the shadow will be formed
(b) When can an object be seen?
Ans: An object can be seen when the light will reflect on it.
(c) What is a shadow?
Ans:If an opaque object comes in the way of a light source, light doesn’t pass through it.As a result, the light doesn’t reach a wall or any other surface on the other side of the object.That part remains dark. This dark part is called the ‘shadow of the object’.