Now, reversing the path of the ray of the light, i.e TSQP instead of PQST as the path, it is seen that the angle of deviation is same. Thus, in general there are two angles of incidence i & e, for which d is same; however when d is the minimum angle of deviation, dm then i = e as illustrated in graph of d V_si (see figure ).

Index

Light

16.1 Laws of Reflection at plane surfaces
16.2 Mirrors
16.3 Laws of Refraction at plane surfaces, Refractive Index and Critical Angle
16.4 Refraction at curved spherical surfaces and Lens maker’s formula
16.5 Lenses
16.6 Refraction in Prisms, Prism Formula
16.7 Dispersion of Light, Angular Dispersion and Dispersive Power
16.8 Optical Instruments and Magnifying Power

Chapter 17