Published by:
CGP EDU Academic Team
Published on: September 13, 2026
A single slit of width a is illuminated by a monochromatic light of wavelength 600 nm. The value of a for which first minimum appears at 
= 30° on the screen will be :
A
1.2 
m
m
B
3 
m
m
C
1.8 
m
m
D
0.6 
m
m
Text Solution
Verified by ExpertsThe correct answer is:
A
For the first minima
The given data is
= 30°
= 600 nm
The value of a is
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