(a) Angular width of fringe in double-slit experiment is given by
D= spacing between the slits
Given, wavelength of light A= 600 nm
Angular width of fringe,
(b) The frequency and wavelength of reflected wave will not change.
The refracted wave will have same frequency, only wavelength will change.
The velocity of light in water is given by,
Where, v= velocity of light
f= frequency of light
= wavelength of light
As light ray is travelling from rarer medium to denser medium, its speed will decrease. Hence wavelength will also decrease.
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