Write the answers to the following.
(a) What things are necessary for the formation of a shadow ?
(b) When can an object be seen?
(c) What is a shadow?

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Solution

(a) The things necessary for the formation of a shadow are:

A source of light

An opaque object whose shadow has to be formed

A screen on which shadow is to be formed

(b) An object is seen when the light rays reflected from its surface reaches our eyes.

(c) Shadow is a dark patch obtained on a screen where the light from a light source is blocked by an opaque object.

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Similar questions

Which of the following object is necessary for the formation of a shadow?

Write answers the following questions.

(a) Why does an object cast a shadow on a screen?

(b) What is the connection between the formation of shadows and the propagation of light?

(d) When does a solar eclipse take place?

1.	A non-luminous object	.......................	.......................
2.	A transparent object	.......................	.......................
3.	A regular surface (for reflection)	.......................	.......................
4.	An object whose shadow can be seen	.......................	.......................

Light is necessary for the formation of a shadow.