,a light ray travels from glass to water the speed of light in glasss is 2*10^8m/s if the deepeness of water is 400m then how much time will it take

velocity in glass = 2×108 m/srefractive index of waterrefractive index of glass = velocity in glassvelocity in water1.331.5 =  2×108 vv = 2.25×108m/stime = depthv  = 400 2.25×108 = 177.7×10-8 = 17.77 nano second

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