White light is used to illuminate the two silts in a Young’s double slit experiment. The separation between the slits is b and the screen is at a distance d (> > b) from the slits. At a point on the screen directly in front of one of the slits, certain wavelengths are missing. Some of these missing wavelengths are :
A
λ = 
B
λ = 
C
λ = 
D
λ = 
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(a,c)
Sol. 
Clearly at Q, path difference = d sin θ
⇒ b sin θ ≈ btan θ ≈ 
= 
Now whenever 
will be odd multiple of 
, those λ ’s will be having minima at point Q.
⇒ 
= 
, 
, 
....
⇒ λ = 
, 
, 
.....
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