When the sunlight reflected by flower enters our eyes, we are able to see the flower. The flower reflects some of the sunlight falling on it in all the direction. We can see a flower because it reflect sunlight falling on it into our eyes. The planets can also be seen in the sky because they are reflectors of Sunlight.Ī flower is a non-luminous object. But moonlight is the sunlight which is reflected from the surface of moon. And to us it appears as if the light is being given out by the moon itself. When sunlight falls on the surface of moon, then some of this light sunlight is reflected by the moon towards the earth. We can see the moon because it reflects sunlight into our eyes. When this reflected light enters our eyes, we can see the non-luminous objects.įor example: Moon is a non-luminous object which does not have its own light. This light is reflected by non-luminous objects in all directions. The non-luminous objects can be seen only when the light coming from a luminous object falls on them. A luminous object can be seen because the light given out by it enters our eyes.Īn object which does not give out its own light is called a non-luminous object.įor example:table, chair, book, flower pot, plants, clothes, bags, pen, pencil, mirror, shoe, moon, earth, planets, etc.
Since luminous objects give out their own light, they can be seen even in the dark. Luminous and Non-luminous objectsĪn object which gives out its own light is called luminous object.įor example:Sun, stars, burning candles, electric bulb, glowing tube light, television screen, a piece of red hot iron, flame of gas burner, firefly are all luminous objects. Man-made sources of light : Those sources of light which have been made by man are called man-made sources of light.įor example: Electric bulb, tubelight, kerosene oil lamp, candle, torch are non-luminous sources of light. Natural Sources of light : Those sources of light which occur in nature as such are called natural sources of light.įor example: Sun, stars, meteors, firefly are natural sources of light. Sources of light can be divided into two groups: natural source of light and man made sources of light. At night we use an electric bulb, tube light, lamp, candle or torch as a source of light. It is about 150 million km away from us, its light makes the daytime bright on the earth. The most important source of light for us is the Sun. The various sources of light around us are Sun, stars, bulb, tubelight, kerosene oil lamp, candle, torch, firefly etc. Sources of lightĪn object which gives out light is called a source of light. Light enables us to see objects from which it comes from or from which it is reflected light. At night artificial light makes us see objects. During the day, Sun’s light allow us to see objects. We need a source of light to make the object visible.
Question 17 How are we able to see the moon? Question 16 What is rectilinear propagation of light? Question 14 State 2 differences between a pinhole camera image and shadows? Question 13 Give an activity to show that light travels in a straight line? Question 12 Why we cannot see the objects placed in a dark room? Question 11 How we are able to see a table lying in a room though it does not give out its own light? Question 10 Why we cannot see a book placed behind a wooden screen? Question 9 On what principle does a pinhole camera object? Question 7 what are translucent materials.
Question 6 What are transparent materials. Question 5 What are man-made sources of light. Question 4 What are non-luminous objects. Question 2 What are natural sources of light. Question 1 Name the most important source of light on Earth?
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