1.

Time taken by the sunlight to pass through a slab of 4 cm and refractive index 1.5 is ...... s.

Answer»

`2xx10^(-8)`
`2xx10^(-10)`
`2xx10^8`
`2xx10^(10)`

Solution :`n=C/v" but "v=d/t`
`thereforen=(CT)/(d)`
`THEREFORE t=(nd)/(c)=(1.5xx4xx10^(-2))/(3xx10^8)`
`therefore t =2xx10^(-10)` s


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