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What is the difference between polarised...

What is the difference between polarised light and unpolarised light based on the direction of electric vector `(vecE)`?
(ii) What will be the effect on the width of the central bright fringe in the diffraction pattern of a single slit if :
(1) Monochromatic light of smaller wave length is used ?
(2) Slit is made narrower ?

Text Solution

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In an unpolarised light, the vibrations of the electric vector occur symmetrically in all possible directions in a plane perpendicular to the direction of propagation of light.
(2) In polarised light, the vibrations of the electric vector are in a plane perpendicular to the direction of propagation of light and they are confined to a single direction.
(ii) (1) Width of the central bright fringe in the diffraction pattern decreases when light of smaller wavelength is used.
(2) Width increases when slit is made narrow.
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