Tag: wave optics

Questions Related to wave optics

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.

A ray of light is incident on the surface of  a glass plate at an angle of incidence equal to Brewster's angle $\phi$. If $\mu$ represents the  refractive index of glass with respect to air, then the angle between the reflected and the refracted rays is

polarisation of light polarisation wave optics optics physics

  1. 90$^o$ + $\phi$

  2. $sin^{-1}$( $ \mu cos \phi$)

  3. 90$^o$

  4. 90 $-sin^{-1}$ $\left (\displaystyle \frac{sin\phi }{\mu}\right )$

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Correct Option: C
Explanation:

When angle of incidence is equal to the Brewster's angle then, the angle between reflected and refracted rays is $ { 90 }^{ o }$

Human eye:

polarisation of light polarisation wave optics optics physics

  1. can detect polarized light

  2. cannot detect polarization of light

  3. can detect only circularly polarized light

  4. can detect only linearly polarized light

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Correct Option: B
Explanation:

Polarization changes when plane of vibration of polarized light changes.
Human eye is insensitive to change in polarization and hence, cannot detect polarization of light.

Polarisation of light was first successfully explained by:

polarisation of light polarisation wave optics optics physics

  1. Corpuscular theory

  2. Huygens' wave theory

  3. Electromagnetic wave theory

  4. Planck's theory

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Correct Option: C
Explanation:

Electromagnetic wave theory explains light as being composed of electric field vibrating in planes.
Polarisation of light refers to vibrating electric field in a particular plane.