•The Sun is the major source of light for the earth. The sun is a massive ball of fire, at the center of which nuclear fusion produces massive energy. This energy comes out as heat and light. The light from the sun is one of the major factors behind the sustainability of life on earth.
•Every other star produces light too, but only a small or no amount of it reaches the earth because of the huge distance.
•The moon provides light as well but it cannot produce light on its own. The light that we get from the moon is the light reflected by it from the sun.
•Some living organisms have the ability to produce light too. It is called bioluminescence. It is the effect of certain chemical reactions within the organism. Fireflies, jellyfish, glow-worm, certain deep-sea plants, and microorganisms can be cited as examples.
•Certain other natural phenomena such as lightning and volcanic eruptions also emit light.
ArtificialSourceof light
•Incandescent Sources:
When certain objects are heated to a high temperature, they begin to emit light. Both infrared and visible light is produced in the process.
Example- Candle, incandescent lamp.
•Luminescent Sources:
Light can be produced by accelerating charges in a luminescent material. One common way of doing it is bypassing current through the material.
Example- Fluorescent tube light, electric bulb
•Gas Discharge Sources:
Passing electricity through certain gases at very low pressure can produce light too.
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Answer:
Natural Source of light
•The Sun is the major source of light for the earth. The sun is a massive ball of fire, at the center of which nuclear fusion produces massive energy. This energy comes out as heat and light. The light from the sun is one of the major factors behind the sustainability of life on earth.
•Every other star produces light too, but only a small or no amount of it reaches the earth because of the huge distance.
•The moon provides light as well but it cannot produce light on its own. The light that we get from the moon is the light reflected by it from the sun.
•Some living organisms have the ability to produce light too. It is called bioluminescence. It is the effect of certain chemical reactions within the organism. Fireflies, jellyfish, glow-worm, certain deep-sea plants, and microorganisms can be cited as examples.
•Certain other natural phenomena such as lightning and volcanic eruptions also emit light.
Artificial Source of light
•Incandescent Sources:
When certain objects are heated to a high temperature, they begin to emit light. Both infrared and visible light is produced in the process.
Example- Candle, incandescent lamp.
•Luminescent Sources:
Light can be produced by accelerating charges in a luminescent material. One common way of doing it is bypassing current through the material.
Example- Fluorescent tube light, electric bulb
•Gas Discharge Sources:
Passing electricity through certain gases at very low pressure can produce light too.
Example – Neon lamp, Sodium lamp