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(a) Explain two features to distinguish ...

(a) Explain two features to distinguish between the interference pattern in Young's double slit experiment with the difference pattern obtained due to a single slit.
(b) A monochromatic light of wavelength `500 nm` is incident normally on a single slit of width 0.2 nm of produce a diffraction pattern. Find the angular width of the central maximum obtained on the screen.
Estimate the number of fringes obtained in Young's double slit experimental with fringe width `0.5 mm`, which can be accommodated within the region of total angular spread of the central maximum due to single slit.

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Explanation of two features (dintinguishing between interference pattern and diffraction pattern.)
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