1.

The time taken by the sunlight to reach the bottom of a tank of depth 4.5m filled completely with water is ....... ns. The refractive index of water is 4/3

Answer»

2
1.5
20
200

Solution :`n=c/v=c/d=(CT)/(d)`
`THEREFORE t =(nd)/(c)`
`=4/3xx(4.5)/(3xx10^8)=(18)/(9)xx10^(-8)=2xx10^(-8)` second
`therefore t=20xx10^(-9)` second = 20 MS


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