1.

The refractive indices of glass and water with respect to air are 3/2 and 4/3 respectively. If speed of light in glass is 2xx10^(8)m//s. Find the speed of light in water.

Answer»

SOLUTION :Refractive index of a medium
`=("Speed of LIGHT in air")/("Speed of light in the medium")`
`3/2=("Speed of light in air")/(2xx10^(8)m//s)`
Speed oflight in air
`=3xx10^(8)m//s`
Speed of light in WATER
`=(3xx10^(8)m//s)/(4//3)=2.25xx10^(8)m//s=1`


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