Q19. PQR is a right-angled prism with other angles as 60o and 30o. The Refractive index of the prism is 1.5. PQ has a thin layer of liquid. Light falls normally on the face PR. For total internal reflection, the maximum refractive index of the liquid is:Physics — Optics, Nature of Light and Optical Instruments — Question 19 of 155A. 1.4 B. 1.3 C. 1.2 D. 1.6 Practice more Physics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →