Angular width of the central maxima in the Fraunhofer diffraction for 
is 
. When the same slit is illuminated by another monochromatic light, the angular width decreases by 
. The wavelength of this light is [NEET 2019]
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
The angular width of central maxima is given by
…… .(i)
where, 
wavelength of light used
width of the slit
For 
(given)
For another light of wavelength 
(says), the angular width decreases by 
, so
As slit width is constant, so using Eq. (i) for these values, we get
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