The refractive index μ = c/v = fλο/fλ = λο/λ
Νumber of waves in a slab of thickness t = n = t/λ or n/t = 1/λ
So μ= λο/λ= λοn/t.
For A 3/2 = λο*n/t.........(1)
For B μB = λο*n1/(t/3) ......(2)
For C 1.6 = λο*n2/(2t/3)...(3)
Form eq. 1, 2 and 3 find n, n1 and n2.
Now n = n1 + n2. Substitutes the values of n, n1 and n2 and find μB.
