(a) Explain (i) refraction of a wave;
(ii) critical angle

(b) State two conditions necessary for (i) total internal reflection of a wave to occur
(ii) interference wave patterns to be formed

(c) The distance between two successive crests of a water wave travelling at 3.6ms\(^{-1}\) is 0.45m, calculate the frequency of the wave

(d) A ray of light is incident at an angle of 30° at an air-glass interface.
(i) Draw a ray diagram to show the deviation of the ray in the glass.
(ii) Determine the angle of deviation. [Refractive index of glass = 1.50]