Question

what is the velocity of light if it passes through water and then air

Answer 1

we know velocity of light in air,c=3×10^8m/sec
and refractive index of water w.r.t air,=1.33
ref.index of water w.r.t air=speed of light in air/speed of liget in water
velocity of water=3×10^8/1.33=2.25×10^8 m/sec...


so,2.25×10^8m/sec. is the answer

I guess it's right...