A parallel beam of light of all wavelengths greater than 
falls on a double slit in a Young's double slit experiment. It is observed that the wavelengths 
and 
are absent at a distance of 31.5 mm from the position of the central maximum, and the orders of the interference at this point for the two wavelengths differ by 7 . If the distance between the slits and the screen is 1 m , the separation between the two slits is
Text Solution
Verified by ExpertsThe correct answer is:
C
At 
, both 
and 
produce minima. If the slit separation is 
, then,
Substituting the values,
We get 
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