Question

Q.Refractive index of water is 4/3 and that of the glass is 3/2 with regard to air.What is the refractive index of glass with respect to the water?

Answer 1

2 is refractive Index.

Answer 2

When there are 3 media air, water, glass
we have
water with respect to air ×glass with respect to water and ×air with respect to glass
Now
glass with respect to water = 3/2/4/3=9/8