(a) State two factors which affect the angle of deviation of a ray of light through a triangular glass prism. (b) Seven virtual images of an object are formed when two plane mirrors are inclined at an angle \(\theta\) to each other. Calculate the value of \(\theta\). (c) By means of a ripple tank, a student was able to generate a series of transverse waves by varying the frequency of the dipper, and all the waves so generated covered a distance of 0.80 m in 0.2s. (i) Determine the speed, v, of the waves. Copy and complete the table given in your answer booklet. (iii) Plot a graph with f on the vertical axis and \(\lambda ^{-1}\) on the horizontal axis. (iv) What does the slope of the graph represent?