JAMB - Physics (2005 - No. 33)
The figure above shows a plot of angles of deviation through a glass prism when light is incident at θ degrees on the prism. The incident angle that produces the minimum deviation is
20o
18o
35o
25o
הֶסבֵּר
From the given graph, when the angle of minimum deviation = 18º, the angle of incidence = 25º