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  4. A glass slab of thickness t and refractive index μ . Calculate the time taken by light to travel this thickness.

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Q. A glass slab of thickness t and refractive index $ \mu $ . Calculate the time taken by light to travel this thickness.

MHT CETMHT CET 2010

Solution:

Time taken by light ray to pass through glass
slab $=\frac{\mu t}{c}$
where $\,\, t=$ geometrical path
$\mu t=$optical path