In Young's 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 
be the wavelength of monochromatic light incident on slit 
, then the angular distance between two consecutive fringes, i.e., the angular fringe width is
……… (i)
where, 
distance between coherent sources.
Given, 
So, from Eq. (i), 
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