At two points P and Q on a screen in Young’s double slit experiment, waves from slits S 1 and S 2 have a path difference of 0 and 
respectively. The ratio of intensities at P and Q will be :
A
2 : 1
B
: 1
C
4 : 1
D
3 : 2
Text Solution
Verified by ExpertsThe correct answer is:
A
Sol. Δ x 1 = 0
Δφ = 0º
Ι 1 = Ι 0 + Ι 0 + 2 Ι 0 cos0º = 4 Ι 0
Δ x 2 = 
Δθ = 
= 
Ι 2 = Ι 0 + Ι 0 + 2 Ι 0 cos 
= 2 Ι 0
= 
= 
.
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