A slit of width ‘a’ is illuminated by light of wavelength 6000 A 0 For What value of ‘a will the :-
(i) First maximum fall at an angle of diffraction of 30 0 ?
(ii) First minimum fall at an angle of diffraction 30 0 ?
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(i)1.8 μ m (ii)1.2 μ m
Sol. (i) For first maximum
sin θ m = 
sin θ 1 = 
or a = 
= 
= 1.8 μ m
(ii) For first minimum
sin θ m = 
or sin θ 1 = 
a = 
a = 
= 1.2 μ m
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