Question

What is light? Mention two important uses of light?​

Answer 1

Answer:

Almost all living beings depend on light for their food and energy. Plants and other autotrophs synthesize their own food materials by use of light. The light which falls on the leaves of a plant is trapped. The trapped energy is converted to reserve energy in the form of food by the process of photosynthesis.

Answer 2

Light is electromagnetic radiation that can be detected by the human eye. Electromagnetic radiation occurs over an extremely wide range of wavelengths, from gamma rays with wavelengths less than about 1 × 10−11 metres to radio waves measured in metres

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