(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 0 to each other. Calculate the value of 0.
(c) By means of a ripple tank, a student was able to generate 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?
Explanation
(a) Factors that affect angle of deviation:
- angle of incidence
- refracting angle of the prism
- refractive index of the prism material.
(b) N = \(\frac{360}{\theta}\) = 1
7 = \(\frac{360}{\theta}\) = 1
\(\theta = 45^o\)
(c) V = s/t = \(\frac{0.8}{0.2}\)
= 4 m/s
(ii)
(ii)
(iv) The slope represents speed or velocity