Tag: polarisation of light

Questions Related to polarisation of light

Unpolarised light of intensity $I _{o}$ passes through two polaroids; the axes of one is vertical. The intensity of transmitted light is:

polarisation of light polarisation wave optics optics physics

  1. $\dfrac {l _{0}}{4}$

  2. $\dfrac {l _{0}}{8}$

  3. $\dfrac {l _{0}}{2}$

  4. $\dfrac {3l _{0}}{4}$

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Correct Option: C

The plane of variation and the plane of polarisation of beam of light

polarisation of light polarisation wave optics optics physics

  1. are identical to each other

  2. are orthogonal to each other

  3. make an angle. which depends on the colour of the light

  4. rotate with respect to each other along the path of the beam

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Correct Option: A

Unpolarised light is incident on a glass surface at polarising angle of $57.5^0$, then the angl between the incident ray & refracted ray is :-

polarisation of light polarisation wave optics optics physics

  1. $57.5^0$

  2. $115^0$

  3. $205^0$

  4. $145^0$

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Correct Option: C

Choose the correct statement ______

polarisation of light polarisation wave optics optics physics

  1. Brewster's angle is independent of the wavelength of light.

  2. Brewster's angle is independent of nature of reflecting the surface.

  3. Brewster's angle is different for different wavelengths.

  4. Brewster's angle depends on the wavelength but not on the nature of reflecting the surface.

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Correct Option: C
Explanation:

Brewester's angle depends on the wavelength of light because Brewester's angle depends on the refractive index of medium and refractive index depends on the wavelength of light. 

For a given medium, the polarising angle is $  60^{\circ} .  $ What is the critical angle for this medium?

polarisation of light polarisation wave optics optics physics

  1. $\tan^{-1}(\dfrac 1{\sqrt 3})$

  2. $\sin^{-1}(\dfrac 1{\sqrt 3})$

  3. $\tan^{-1}( {\sqrt 3})$

  4. $\sin^{-1}({\sqrt 3})$

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Correct Option: B

Which of the following properties shows that light is a transverse wave?

polarisation of light polarisation wave optics optics physics

  1. Reflection

  2. Interference

  3. Diffraction

  4. Polarization

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Correct Option: D
Explanation:

The polarization phenomenon, verifies the transverse nature of light. Since sound has longitudinal nature, so it does not show polarization effect.

When the light is incident at the polarizing angle on transparent medium, then the completely polarized light is 

polarisation of light polarisation wave optics optics physics

  1. refracted light

  2. reflected light

  3. refracted and reflected light

  4. neither reflected nor refracted light

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Correct Option: B
Explanation:

When the light is incident at the polarising angle on the transparent medium, the reflected light is completely polarised.

Which of the following cannot be polarised ?

polarisation of light polarisation wave optics optics physics

  1. Radio waves

  2. $\beta$ rays

  3. Infrared rays

  4. $\gamma$ rays

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Correct Option: B
Explanation:

$ \beta $ are stream of particles comprising of electrons moving with very high velocity, hence it cannot be polarized, while others can as they are electromagnetic waves.

The transverse nature of light is shown by

polarisation of light polarisation wave optics optics physics

  1. interference of light

  2. refraction of light

  3. polarization of light

  4. dispersion of light

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Correct Option: C
Explanation:

Polarisation of light establishes that light are transverse in nature, otherwise it was believed that they are longitudinal waves, like the sound waves.

Polarisation of light establishes

polarisation of light polarisation wave optics optics physics

  1. corpuscular theory of light

  2. quantum nature of light

  3. transverse nature of light

  4. all of the above

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Correct Option: C
Explanation:

Polarisation of light establishes that light are transverse in nature, otherwise it was believed that they are longitudinal waves, like the sound waves.