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A 0.02 cm wide slit is illuminated at no...

A `0.02 cm` wide slit is illuminated at normal incidence by light having wavelength `6 xx 10^(-7)m`.
(i) Find the width of the central band maximum on the screen which is `1 m` away from slit.
(ii) What would be the width of central maximum, if the apparatus is immersed in water whose refractive index is `4//3` ?

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