(a)(i) State the laws of refraction of light.

(ii) Describe an experiment to determine the refractive index, n, of the material of an equilaleral triangular glass prism using the minimum deviation method.

(b) A rectangular glass prism of thickness 12cm is placed on a mark on a piece of paper resting on a horizontal bench:

(i) Draw a ray diagram to show the apparent position of the mark in the glass prism.

(ii) If the refractive-index of the material of the prism is 1.5, calculate the apparent displacement of the mark.