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Question 4: NCERT Solutions for 12th Class Physics: Chapter 9-Ray Optics and Optical Instruments
Figures (a) and (b) show refraction of a ray in air incident at 60° with the normal to a glass- air and water-air interface, respectively. Predict the angle of refraction in glass when the angle of incidence in water is 45° with the normal to a water-glass interface (figure c).
Solution:
(a) Applying Snell’s law for the refraction from air to glass. Refractive index of glass w.r.t. air
(b) Now Snell’s law for the refraction from air to water
(c) Now the light beam is incident at an angle 45° from water to glass
Check the complete chapter with solutions.
NCERT Solutions for 12th Class Physics: Chapter 9-Ray Optics and Optical Instruments