Question

Compare dispersing light into colors with a prism and with a grating. The 30-60-90 triangle prism is made of glass with indices n red =1.52 and n blue=1.53. The grating has 500 slits per millimeter. Light enter the triangle prism and then enters the grating. What is the angular separation between red and blue light leaving the prism in degrees? Please explain.

Answer 1

Soen: - 60'd Tridally, cohen light enters forism, there is no deviation in both light on it is perpendicular to surface. Deviahon will occur, cohen wave come out. for red n = 1.52 . n, Sin 30'= 1 Since, Sino, = 1.52*1 = 0.76 19, = 49.46| 0,- for blue, No=1.53 n2 Sin 30= 1 Sinan 3) Sin02 21.53x1 = 0.765 3) pe 2 = 49.907'] .Angelea separahon , faro 37 0447] (40 = 09-01)