Four pairs of transparent media are listed below: P: Flint glass (1.65) to air (1.00)…
PHYSICS · Subjective · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments
Problem
Four pairs of transparent media are listed below:
P: Flint glass (1.65) to air (1.00)
Q: Quartz (1.46) to water (1.33)
R: Benzene (1.50) to carbon tetrachloride (1.46)
S: Crown glass (1.52) to glycerine (1.47)
(The numbers in brackets are absolute refractive indices.)
(a) Arrange the pairs P, Q, R and S in ascending order of their critical angles.
(b) For pair Q, calculate the numerical value of the critical angle.
(c) If a light beam in medium R is incident on the interface with carbon tetrachloride at 60∘ to the normal, state with reason whether refraction or total internal reflection will occur.
(d) Explain why pair P is preferred over pair Q for constructing an optical device that relies on total internal reflection.