A) 3.33 m sec
B) 6.67 m sec
C) 5.77 m sec
D) 3.85 m sec
Correct Answer: D
Solution :
When total internal reflection just takes place from lateral surface \[i=C\] i.e. \[{{60}^{o}}=C\] \[\Rightarrow \sin {{60}^{o}}=\sin C=\frac{1}{\mu }\Rightarrow \mu =\frac{2}{\sqrt{3}}\] Time taken by light to traverse some distance in a medium \[t=\frac{\mu x}{c}=\frac{\frac{2}{\sqrt{3}}\times {{10}^{3}}}{3\times {{10}^{8}}}=3.85\]m sec.
You need to login to perform this action.
You will be redirected in
3 sec
