Question

Light travels through a glass plate of thickness t and having a refractive index p. If c is the velocity of light in vacuum, the time taken by light to travel this thickness of glass is

• A. $\frac{t}{ \mu c}$
• B. $\frac{\mu t }{ c }$
• C. $t \mu c$
• D. $\frac{tc}{\mu }$

Answer 1

Answer: (B)

$\frac{\mu t }{ c }$

Answer 2

$Time= \frac{distance}{velocity} = \frac{ t}{v} = \frac{t}{c/ \mu } = \frac{\mu t}{ c }$