In double slit experiment, the angular width of the fringes is 
for the sodium light 
. In order to increase the angular width of the fringes by 
, the necessary change in wavelength is
Text Solution
Verified by ExpertsD
Let 
be wavelength of monochromatic light incident on slit 
, then angular distance between two consecutive fringes, that is the angular fringe width is
where 
is distance between coherent sources.
Give, 
So, from eq. ,
(increases)
Note : Since, 
, as 
increases, 
increases.
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