Question

9. How long will the light take
in travelling a distance of
500 m in water. Refractive
index of water is473.​

Answer 1

Answer:

this is the correct answer

Answer 2

Answer:

To solve this we must know the refractive index of water under given conditions because the index of water is not constant over temperature or wavelength to 3 decimal places. It varies in the 3rd decimal place with these and with salinity (though not by much)

Now assuming ideal conditions and pure water in this case, the refractive index is 1.333

So speed of light in pure water with refractive index 1.333= 2.25E8 m/s

Time taken to travel 500m= ( 500/2.25E8) = 2.22 μs

So the duration comes out to be 2.22 micro seconds when water is pure and conditions are ideal.