1.

The time taken by the light to cross a glass of thickness 4 mm and refractive index (mu = 3), will be

Answer»

`4 xx 10^(-11) sec`
`16 xx 10^(-11) sec`
`8 xx 10^(-11) sec`
`24 xx 10^(-11) sec`

Solution :TIME , t `=("THICKNESS of glass")/("Speed of light in glass")=(d)/(c//a)=(mud)/(c)=(3xx4xx10^(-3))/(3XX10^(8))=4xx10^(-11)s`


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