White light reflected from a soap film (Refractive index 
) has a maxima at 
and a minima at 
with no minimum in between. Then the thickness of the film is 
.
Text Solution
Verified by ExpertsThe correct answer is:
C
: The condition for an interference maximum in the light reflected from an soap film of thickness 
is
and that for interference minimum is
Here, 
. Now there is a maximum for 
and there is minimum for 
(i)
(ii)
In view of Eq. (i), we have taken the integer 
rather than 
in Eq. (ii)
Comparing (i) and (ii), we get
Substituting 
, in Eq. (i), we get
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