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:

Explanation:

Given :    nwater​=4/3          nglass​=3/2​             vglass​=2×108  m/s            nair​=1

Speed of light in a medium        vmedium​=c/n​        

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

(a) :     vglass​=c/nglass​c

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

(b) :     vwater​=nwater​c​

∴     vwater​=3×10*8​/(4/3)=2.26×108  m/s