Q10 of 26 Page 1

State Brewster’s law. The value of Brewster angle for a transparent medium is different for light of different colours. Give reason.

Brewster's law, relationship states that a light ray may achieve polarization if the light ray falls on a surface of a transparent medium in such a manner that the angle between the reflected and refracted ray is


The Brewster angle is dependent upon the refractive index and wavelength, which is different for different colours therefore, the Brewster’s angle is different for different colours.


More from this chapter

All 26 →
8

A nucleus with mass number A = 240 and BE/A = 7.6 MeV breaks into two fragments each of A = 120 with BE/A = 8.5 MeV. Calculate the released energy.

OR


Calculate the energy in fusion reaction:


, where BE of


9

Two cells of emfs 1.5 V and 2.0 V having internal resistances 0.2 Ω and 0.3 Ω respectively are connected in parallel. Calculate the emf and internal resistance of the equivalent cell.

 11

A charge is distributed uniformly over a ring of radius ‘a’. Obtain an expression for the electric intensity E at a point on the axis of the ring. Hence show that for points at large distances from the ring, it behaves like a point charge.

 12

Write three characteristic features in photoelectric effect which cannot be explained on the basis of wave theory of light, but can be explained only using Einstein’s equation.