Question

If the absolute refractive index of glass and water is

-



and



,

respectively then find the ratio of speed of light in water and glass.​

Answer 1

Answer:

Given :    nwater=34           nglass=23             vglass=2×108  m/s            nair=1

Speed of light in a medium        vmedium=nc         

where  c and n are the speed of light in vacuum and refractive index of medium respectively.

(a) :     vglass=nglassc

∴     2×108=(3/2)c                        ⟹c=3×108  m/s

(b) :     vwater=nwaterc

∴     vwater=(4/3)3×108=2.26×108  m/s    

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