Light and the Formation of Shadows - Standard 6 - General Science - Balbharati

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 14. Light and the Formation of Shadows

Exercise

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.


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 Group B
(a) Mirror (3) Reflection
(b) Firefly (4) Luminous
(c) Pinhole camera (2) Inverted image
(d) Moon (1) Non-luminous

Q. 4 Write the answers to the following.

(a) What things are necessary for the formation of a shadow?

Ans. For the formation of a shadow three things are necessary — a source of light, an opaque object and a screen.

(b) When can an object be seen?

Ans. An object can be seen when light reflected from its surface enters our eyes.

(c) What is a shadow?

Ans. When an opaque object comes in the way of light, light does not pass through it. The dark patch formed on the screen behind the object is called its shadow.

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