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Diffraction is a phenomenon that is severely associated with light. That is to utter that light and only light undergoes diffraction. (By light here we denote any form of electromagnetic radiation--not just visible light.)
Answer:
Diffraction is a wave phenomenon and it takes place for all kinds of waves. For example waves in the surface of water undergo diffraction. Thus do sound waves in air.
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Electric Circuit: The path by which an electric current passed is known as an electric circuit. The electric appliances are known as resistance.
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