An equilateral prism of refractive index `mu = (4)/(sqrt(3))` is kept in a medium of refractive index `mu_(1)`. Consider a light ray to be normally incident on one of the refracting faces. The diagram shows variation of magnitude of angle of deviation `(beta)` with respect to `mu_(1)`.

(a) Find value of `k_(2)`.
(b) Find value of `k_(1)`.