Physics - Geometrical Optics Question with Solution | TestHub

In the formation of secondary rainbow, light suffers two total internal reflections instead of one. In this, ray undergoes two internal partial reflections having a maximum deviation of about $50^{\circ }$ for red and $54^{\circ }$ for violet. Also secondary rainbow will sometimes be formed with inverted colours. Secondary rainbow is fainter than the primary for two reason (i) the light has undergone two internal reflections and has therebybecomes weakened, (ii) there is greater angular dispersion in this rainbow than in the primary.