13. Light travels through a glass plate of thickness t and refractive index μ. If c is the speed of light in vacuum, the time taken by light to travel this thickness of glass is ?
(a) \( \mu t c \)
(b) \( \frac{t c}{\mu} \)
(c) \( \frac{t}{\mu c} \)
(d) \( \frac{\mu t}{c} \)
Answer : (d) \( \frac{\mu t}{c} \)
\( \mu = \frac{c}{v} \)
\( v = \frac{c}{\mu} \)
\( velocity = \frac{distance}{\text{time}} \)
\( \text{time} = \frac{\text{distance}}{\text{velocity}} \)
\( = \frac{t}{\frac{c}{\mu}} \)
\( = \frac{\mu t}{c} \)
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