Question

if the refractive index of air with respect to glass is2/3 and that of diamond with respect to air is 12/5, then the refractive index of diamond with respect to glass will be

Answer 1

R (a/g)=2/3
g/a = 2/3
R (d/a)= 12/5
a/d = 12/5
g/a*a/d=2/3 *12/5
= 24/15 =8/5

Answer 2

The answer is

2/3*12/5

8/5