luminous and non luminous objects

Concept Explanation

luminous and non luminous objects

There are two types of objects:

Luminous Objects: Objects that give out light are called luminous objects. All luminous objects emit light that has been produce by them. We can see a luminous object because the light emitted by them reaches our eyes and creates a sense of vision. All luminous objects are sources of light like the sun, the stars, a burning candle, a lighted electric bulb and a firefly etc.

Sun

Stars

Candle

Bulb

Firefly(Jugnoo)

Non Luminous Objects: Objects that do not give out light are called non luminous objects. All non-luminous objects can not emit light as they cannot produce any light. We can see a non luminous object because when a light falls on the non luminous object it is reflected back this light reaches our eyes and creates a sense of vision. Fan, planets, books, moon, flowers etc. are all non - luminous object. We see moon as it reflects the light of sun falling on it. The non - luminous objects are also called illuminated objects because they get illuminated by the light of luminous objects.

Fan

Planets

Books

Moon

Flower

Difference between Luminous and Non Luminous Objects

S.No.	Luminous Objects	Non Luminous Objects
1	Objects that give out light are called luminous objects.	Objects that do not give out light are called non luminous objects.
2	All luminous objects emit light that has been produce by them.	All non-luminous objects can not emit light as they cannot produce any light.
3	We can see a luminous object because the light emitted by them reaches our eyes and creates a sense of vision.	We can see a non luminous object because when a light falls on the non luminous object it is reflected back this light reaches our eyes and creates a sense of vision
4.	All luminous objects can act as sources of light because they emit light	All Non luminous objects cannot act as sources of light because they do not emit light
5	For example sun	For Example Planets

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Sample Questions

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Question : 1

Which of the following are correct : (a) Objects that give out light are called luminous objects. (b) Objects that do not give out light are called non luminous objects.
A. Only (a) is correct.		B. Only (b) is correct.
C. Both (a) and (b) are correct.		D. None of these.
Right Option : C
View Explanation

Question : 2

The Sun is a ______________________
A. A natural source of light	B. An artificial source of light	C. A luminous body	D. Both (a) and (c)
Right Option : D
View Explanation

Question : 3

Which of the following are correct : (a) Objects that give out light are called non luminous objects. (b) All luminous objects emit light that has been produce by them.
A. Only (a) is correct.		B. Only (b) is correct.
C. Both (a) and (b) are correct.		D. None of these.
Right Option : B
View Explanation

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