What is the unit of refractive index?

A glass of refractive index 1.45 disappears when immersed in a liquid. What is the value of refractive index of the light?

What is the value of refractive index of a medium of polarising angle 60^@ ?

A thin prism of 20^@ angle gives a deviation of 1^@ . What is the value of refractive index of the material of the prism?

A thin prism of 2^@ angle gives a deviation of 1^@ . What is the value of refractive index of the material of the prism?

A thin prism of 5^@ angle gives a deviation of 3.2^@ .What is the value of refractive index of teh material of the prism?

What is the value of refractive index of a medium of polarising angle 60^@ ? (mu = sqrt3 = 1.732) .

Define refractive index?

A glass lens of refractive index 1.5 is placed in a trough of liquid. What must to be the refractive index of the liquid in order to make the lens diappear.