In-text Questions 1. What is light? 2. Group these as natural and artificial sources of light - the sun, a bulb, a firefly, a torch, a candle. 3. The moon is not a luminous body then how does it shine at night? 4. Mention the common point between the stars and a bulb? 5. Mention the difference between the stars and a bulb?
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Light or visible light is electromagnetic radiation within the portion of the electromagnetic spectrum that is perceived by the human eye. Visible light is usually defined as having wavelengths in the range of 400–700 nanometres, between the infrared and the ultraviolet.
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