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Explain what is meant by diffraction of ...

Explain what is meant by diffraction of light. Describe a simple experiment to demonstrate diffraction at a single slit.

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(a) (i) What is meant by diffraction of light? (ii) In Fraunhofer diffraction, what kind of source of light is used and where is it situated ? (b) Obtain the relation, d sin theta= lambda for the first minima of the diffraction pattern of a single slit of width d using light of wavelength lambda .