polarisation questions with solutions

Showing 1–10 of 29 questions

• MCQeasyWave Opticspolarisation

  The ratio of speeds of electromagnetic waves in vacuum and a medium, having dielectric constant k = 3 and permeability of μ = 2μ₀, is

  (μ₀ = permeability of vacuum)

  Options

  • Option A

    36 : 1

  • Option B

    3 : 2

  • Option C

    6 : 1

  • Option D

    √6 : 1

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• Multi-correctmediumWave Opticspolarisation

  Which of the following statements are correct for light incident at the Brewster angle on a transparent dielectric interface?

  Select all that apply

  • Option A

    The reflected and refracted rays are mutually perpendicular

  • Option B

    The reflected beam is completely plane polarized

  • Option C

    For incidence from medium n₁ to medium n₂, tan i(B) = n₁ ÷ n₂

  • Option D

    The reflected p-polarized component becomes zero

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• MCQmediumWave Opticspolarisation

  A frictionless inclined plane is adjusted so that its inclination to the horizontal is equal to the Brewster angle for a transparent material of refractive index 4 ÷ 3 relative to air. A small block is released from rest on the plane. What is the block's acceleration along the incline?

  Options

  • Option A

    3g ÷ 5

  • Option B

    4g ÷ 5

  • Option C

    g ÷ 2

  • Option D

    5g ÷ 6

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• MCQeasyWave Opticspolarisation

  A beam of unpolarised light of intensity I₀ is passed through a polaroid A and then through another polaroid B which is oriented so that its principal plane makes an angle of 45° relative to that of A. The intensity of emergent light is :

  Options

  • Option A

    I₀/4

  • Option B

    I₀

  • Option C

    I₀/2

  • Option D

    I₀/8

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• MCQmediumWave Opticspolarisation

  Plane-polarized light of intensity I₀ is incident on an ideal analyser whose transmission axis rotates uniformly with angular speed Ω. What is the time period of the transmitted-intensity variation?

  Options

  • Option A

    2π ÷ Ω

  • Option B

    π ÷ Ω

  • Option C

    π ÷ (2Ω)

  • Option D

    4π ÷ Ω

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• MCQmediumWave Opticspolarisation

  Plane-polarized light of intensity I₀ is incident on a sequence of three ideal polaroids whose transmission axes are at 0°, θ and 90°, respectively. The electric field of the incident light is parallel to the 0° axis. If the final transmitted intensity is I₀ ÷ 16, what is the least positive value of θ?

  Options

  • Option A

    15°

  • Option B

    22.5°

  • Option C

    30°

  • Option D

    45°

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• MCQmediumWave Opticspolarisation

  Unpolarized light is incident on the plane air-dielectric interface shown in the figure at the Brewster angle. Using the x, y and z directions indicated in the figure, which expression corresponds to the reflected electric field according to the given coordinate convention?

  

  Options

  • Option A

    (Eₓî+Eᵧĵ) sin(kx-kz-ωt)

  • Option B

    (Eₓî+E(z)k̂) sin(kx+ky-ωt)

  • Option C

    (Eₓĵ+Eᵧk̂) sin(ky+kz-ωt)

  • Option D

    (Eₓî+Eᵧĵ+E(z)k̂) sin(kx+ky-kz-ωt)

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  JEE Mains 2026 4 April Morning Shift

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• NumericmediumWave Opticspolarisation

  As shown in the figure, a ray AB of unpolarized light enters from water of refractive index n(w) = 4/3 into a medium of refractive index n(p) = 4/√3 after passing through a glass plate of refractive index n(g) = 1.5 and a layer of water. At a particular incident angle i the reflected ray CD is polarized in the direction as shown in the figure. The value of i (in degrees) is:

  

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• MCQmediumWave Opticspolarisation

  Light travels from glass of refractive index 3 ÷ 2 into air. The light is incident at the Brewster angle for this glass-air interface. What is sin i(B)?

  Options

  • Option A

    2 ÷ √13

  • Option B

    3 ÷ √13

  • Option C

    2 ÷ 3

  • Option D

    1 ÷ √3

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• MCQeasyWave Opticspolarisation

  When unpolarized light is incident at an angle of 60° on a transparent medium from air. The reflected ray is completely polarized. The angle of refraction in the medium is

  Options

  • Option A

    30°

  • Option B

    60°

  • Option C

    90°

  • Option D

    45°

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