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
A
zero
B
increased by 
C
decreased by 
D
increased by 
Text Solution
Verified by ExpertsThe correct answer is:
D
Let λ be wavelength of monochromatic light incident on slit S, then angular distance between two consecutive fringes, that is the angular fringe width is
where d is distance between coherent sources.
Give, 
So, from eq. (1),
(increases)
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