A) \[\frac{t}{\mu c}\]
B) \[t\,\mu c\]
C) \[\frac{\mu t}{c}\]
D) \[\frac{tc}{\mu }\]
Correct Answer: C
Solution :
As, the refractive index for any medium, \[\mu =\frac{velocity\text{ }of\text{ }light\text{ }in\text{ }vacuum}{velocity\text{ }of\text{ }light\text{ }in\text{ }glass\text{ }plate}\] \[=\frac{C}{C},\] or \[c'=\frac{c}{\mu }\] \[\therefore \] Time taken \[\text{=}\frac{\text{distance}}{\text{velocity}}=\frac{t}{\left( \frac{c}{\mu } \right)}=\frac{\mu t}{c}\]
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