Question

(a) Define refractive index of a transparent medium. What is its unit ? Which has higher refractive index, glass or water ?

(b) A ray of light travelling in air enters obliquely into water. Does the light ray bend towards or away from the normal
(with referance to refractive index).

Answer 1

b)the light bends towards the normal.
(when light moves from rarer to denser median it bends towards the normal)

Answer 2

a) the ratio of the speed of the light in vaccum to the speed of the light in transparent medium is known as refractive index
it has no unit
glass has higher refractive index
b)it will bend toward the normal