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A coin is at rest at bottom of a tank fi...

A coin is at rest at bottom of a tank filled with liquid. A ray of light coming towards surface will move on the surface after incident on it, then what is the speed of light in liquid ?

A

`2.4xx10^8 ms^(-1)`

B

`3.0xx10^8 ms^(-1)`

C

`1.2xx10^8ms^(-1)`

D

`1.8xx10^8ms^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
A, D

Length of hypotenuse of right angle `triangle`1ABC is 5.
`therefore (1)/(mu)=(sini)/(sin 90^@)` …...
(`because` Refractive index of liquid =`mu`, refractive index of air =1)
`therefore mu =(1)/(sini)=5/3`
Now speed `v=(c)/(mu)=(3xx10^8)/(5/3)=1.8xx10^8` m`//`s
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