A) \[30%\]
B) \[27.1%\]
C) \[20%\]
D) \[36%\]
Correct Answer: B
Solution :
Reduction in intensity after passing through first slab is \[=\frac{90}{100}\] of \[I=0.9I\] After second slab, intensity \[=90%\] of \[(0.9I)\] \[=81%\] of \[I\] \[=0.81I\] After third slab, intensity \[=90%\]of \[(0.81\,I)\] \[=72.9%\] of \[I\] \[\therefore \] Reduction in intensity \[=27.1%\]You need to login to perform this action.
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