Light of wavelength 
from a point source falls on a small circular obstacle of diameter 
. Dark and bright circular rings around a central bright spot are formed on a screen beyond the obstacle. The distance between the screen and obstacle is 
. Then, the condition for the formation of rings is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Here, the condition for the formation of rings is 
.
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