Question

State and explain brewster's law for 3 marks

Answer 1

hey mate here is your ans:

Brewster’s law, relationship for light waves stating that the maximum polarization (vibration in one plane only) of a ray of light may be achieved by letting the ray fall on a surface of a transparent medium in such a way that the refracted ray makes an angle of 90° with the reflected ray. The law is named after a Scottish physicist, Sir David Brewster, who first proposed it in 1811.


Brewster’s law also states that the tangent of the angle of polarization, p, for a wavelength of light passing from one substance to another is equal to the ratio of the refractiveindices, n1 and n2, of the two contacting mediums: tan p = n2/n1.

For a light wave passing from air (n1 = 1.00) to glass (n2 = 1.50), the polarizing angle, p, is calculated to be 56°19′.

I hope this help u

Answer 2

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Brewster’s Law :-

• When light is incident on a surface at such an angle that the reflected and transmitted rays are perpendicular, the reflected ray is completely plane polarized.
• Then the index of refraction of the substance is equal to the tangent of the angle of incidence. (n = tan )