A) \[{{I}_{0}}\]
B) \[2{{I}_{0}}\]
C) \[{{I}_{0}}/2\]
D) zero
Correct Answer: D
Solution :
At the centre, geometrical path difference is zero. The optical path difference due to glass plate is: \[\Delta x\,=t\,(\mu -1)=1.5\,\times {{10}^{-6}}\,(1.5-1)\] \[=0.75\,\times {{10}^{-6}}\,m\] \[\frac{\Delta x}{\lambda }\,=\frac{0.75\,\times {{10}^{-6}}}{5000\,\times {{10}^{-10}}}\,=1.5\Rightarrow \,\Delta x\,=3\lambda /2\] Hence, there will be a destructive interference and the new intensity at the centre of screen will be zero.You need to login to perform this action.
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