(a) Explain the term critical angle.

(b) List two factors which determine the deviation of a ray of light by a triangular glass prism.

(c) The angle of refraction (r) of a ray of white light from air through a triangular glass prism of refractive index 1.5 is 29.0°. Calculate the angle through which the ray is least deviated.

(d) Study the ray diagram below and use it to answer the questions that follow.

 

 

Calculate the:

(i) values of angles P,Q and R;

(ii) refractive index n of the glass prism;

(iii) value of e;

(iv) total deviation D.