1.

Time taken by the sunlight to pass through a slab of thickness 4 mm and refractive index 3 is ........ sec.

Answer»

`4 xx 10^(-11)` s
`2 xx 10^(-11)` s
`2.5 xx 10^(10)`s
`36 xx 10^5` s

Solution :`n=C/v=(c)/(d//t)=(ct)/(d)`
`therefore t= (nd)/(c)=(3xx4xx10^(-3))/(3xx10^8)=4xx10^(-11)` s


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