Give two differences between interference and diffraction of light.

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Accepted Answer

Interference Diffraction Superposition of waves from two (or more) coherent sources Superposition of secondary wavelets from different parts of the same wavefront All bright fringes have equal intensity Intensity of bright fringes decreases away from the centre Fringe width is uniform and equal Fringe width is not uniform (central maximum is wider) Dark fringes have zero intensity (perfect) Dark fringes are not perfectly dark

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Interference	Diffraction
Superposition of waves from two (or more) coherent sources	Superposition of secondary wavelets from different parts of the same wavefront
All bright fringes have equal intensity	Intensity of bright fringes decreases away from the centre
Fringe width is uniform and equal	Fringe width is not uniform (central maximum is wider)
Dark fringes have zero intensity (perfect)	Dark fringes are not perfectly dark

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