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Consider a beam of light is incident on a glass slap of refractive index 1.54 is reflected from the surface with an angle of incidence 33°. Now if the reflected ray is passed through a polaroid as shown below, in such case which of the following statement is correct? (Given tan 57° = 1.54)  

Consider a beam of light is incident on a glass slap of refractive index 1.54 is reflected from the surface with an angle of incidence 33°. Now if the reflected ray is passed through a polaroid as shown below, in such case which of the following statement is correct? (Given tan 57° = 1.54)   Correct Answer The intensity gradually reduces to zero and then again increases

CONCEPT:

Brewster's law:

  • According to Brewster's law, the refractive index of the medium is numerically equal to the tangent angle of polarization.

​⇒ μ = tan θp

Where μ = refractive index and θP = polarization angle

  • When the reflected light is completely polarised, then the angle between the reflected and the refracted light is 90°.

Additional Information

Unpolarized light:

  • A light wave that has vibrations in more than one plane is known as unpolarized light.

Polarized light:

  • Polarized light is a light wave in which the vibrations occur in a single plane.

Polarisation by reflection:

  • Brewster discovered that when a beam of unpolarized light is reflected from a transparent medium, then at a certain angle of incidence the reflected light will be completely plane polarised.
  • The angle of incidence at which the light becomes polarised is called the angle of polarisation.

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