Published by:
CGP EDU Academic Team
Published on: August 13, 2026
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 30%. The wavelength of this light is
A
420 
B
1800 
C
4200 
D
6000 
Text Solution
Verified by ExpertsThe correct answer is:
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Now,
….(ii)
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