Question

if the speed of light in water is 2.25×108m/s and the speed in vaccum is 3×108 n calculate the refractive index of water.​

Answer 1

Answer:

RI =3/2.25=1.44 NEARLY

Answer 2

refractive index of a medium is the ratio of speed of light in vaccum to speed of light of light in that medium.

i.e., refractive index of a medium= speed of light in vaccum/speed of light in medium.

here, speed of light in water = 2.25 × 10^8 m/s

and speed of light in vaccum = 3 × 10^8 m/s

so, refractive index of water = 3 × 10^8/2.25 × 10^8

= 3/2.25 = 3/(9/4)

= 4/3

hence, refractive index of water is 4/3