The time required for light to pass through a glass slab of 2 mm thickness is ($\mu_{glass} = 1.5$)
Options:
10–8 s
10–6 s
10–11 s
None of these
Correct Answer:
10–11 s
Explanation:
$\text{Speed of light in glass is } v = \frac{c}{\mu_g} = 2\times 10^8m/s$ $\text{Time taken to cross the glass slab is } t = \frac{d}{v} = \frac{2\times 10^{-3}}{2\times 10^8} = 10^{-11} sec$
