A) 100 nm
B) 300 nm
C) 50 nm
D) 200 nm
Correct Answer: A
Solution :
Condition for constructive interference is \[2\mu t=[2n+1]\frac{\lambda }{2}\] where, \[n=0,1,\text{ }2,3...\] For minimum thickness, \[n=0\] \[2\mu t=\frac{\lambda }{2}\] \[\Rightarrow \] \[t=\frac{\lambda }{4\mu }=\frac{6600\times {{10}^{-9}}}{4\times 1.5}\] = 100 nmYou need to login to perform this action.
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