How Do You Calculate the Refractive Index from Water to Glass?

[reyaz1]

Homework Statement

A ray of light is incident in water on a plane water-glass boundary. The angle of incidence is 30 degrees. Calculate the angle of refraction. (Refractive index of glass with respect to air =3/2, refractive index of water with respect to air = 4/3).

Homework Equations

n1sini = n2sinr

The Attempt at a Solution

I tried approaching it with several methods, but I am puzzled. How do you get the glass to water refractive index from the data given??

Any help would be greatly appreciated. Thank you!

 

[ehild]

Think of the definition of the refractive index.

ehild

 

[rl.bhat]

How do you get the glass to water refractive index from the data given??

It is not necessary to solve this problem.
You can use the relevant equation
n1sini = n2sinr
to find r. Here n1 is the refractive index of water. and n2 is that of glass.

 

[reyaz1]

How do you get the glass to water refractive index from the data given??

It is not necessary to solve this problem.
You can use the relevant equation
n1sini = n2sinr
to find r. Here n1 is the refractive index of water. and n2 is that of glass.

Thank you sooo much! I just needed a nod in the right direction.