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A glass slab of thickness $t$ and refractive index $\mu$. Calculate the time taken by light to travel this thickness.
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Verified Answer
The correct answer is:
$\frac{\mu t}{c}$
Time taken by light ray to pass through glass slab $=\frac{\mu t}{c}$
where $\quad t=$ geometrical path $\mu t=$ optical path
where $\quad t=$ geometrical path $\mu t=$ optical path
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