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How do we see things around us? You will probably say it is EYES that help us to see the objects around us. But will your eyes be able to see these objects in dark? No, we need LIGHT to see things! Without light, we cannot see the objects! But where is this light coming from? This light is coming from this source which is a fluorescent bulb! You see that this bulb is emitting its own light. The objects which emit their own light are called LUMINOUS OBJECTS. Can you give me any other examples? Incandescent light bulb, the sun, the stars are also luminous objects! What about objects such as this table and chair? Do they emit their own light? No, these objects do not emit their own light! Such objects are called NON- LUMINOUS. Almost everything around us is non-luminous. Objects made up of wood, plastic, cotton, metal are all non-luminous! What about the moon and the planets? They are also non-luminous! But if the moon is non-luminous, then how come we are able to see it at night? The ans