polarisation questions with solutions

Showing 1–10 of 38 questions

• 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

  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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• MCQeasyWave Opticspolarisation

  Two plane-polarized light waves combine at a point. Their electric-field components are E₁ = E₀ sinωt and E₂ = E₀ sin(ωt + π/3). The amplitude of the resultant wave is:

  Options

  • Option A

    0.9E₀

  • Option B

    E₀

  • Option C

    1.7E₀

  • Option D

    3.4E₀

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  JEE Mains 2025 7 April Morning Shift

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• MCQmediumWave Opticspolarisation

  Unpolarized light of intensity I₀ passes through a fixed polarizer and then through an analyser whose transmission axis is slowly and uniformly rotated from parallel to perpendicular relative to the first polarizer. What is the average transmitted intensity during this rotation?

  Options

  • Option A

    I₀ ÷ 2

  • Option B

    I₀ ÷ 3

  • Option C

    I₀ ÷ 4

  • Option D

    I₀ ÷ 8

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• MCQeasyWave Opticspolarisation

  An unpolarised light is incident at an interface of two dielectric media having refractive indices of 2 (incident medium) and 2√3 (medium) respectively. To satisfy the condition that reflected and refracted rays are perpendicular to each other, the angle of incidence is ______.

  Options

  • Option A

    60°

  • Option B

    10°

  • Option C

    30°

  • Option D

    45°

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  JEE Mains 202624 January Morning Shift

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• MCQmediumWave Opticspolarisation

  When a polaroid sheet is rotated between two crossed polaroids then the transmitted light intensity will be maximum for a rotation of :

  Options

  • Option A

    60°

  • Option B

    30°

  • Option C

    90°

  • Option D

    45°

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  JEE Mains 2024 27 Jan Evening Shift

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• Multi-correctmediumWave Opticspolarisation

  Vertically polarized headlight light travels along the road, scatters from dust, and is observed from a direction perpendicular to the road as shown. Which statements describe the scattered light?

  

  Select all that apply

  • Option A

    Having no intensity in direction of observer.

  • Option B

    Has electric field in vertical plane ⊥ to car's velocity.

  • Option C

    Has magnetic field parallel to car's velocity but in horizontal plane.

  • Option D

    Has magnetic field in vertical plane parallel to car's velocity.

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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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• 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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• Multi-correctmediumWave Opticspolarisation

  An unpolarized ray is incident on a transparent sphere of refractive index μ=√3 with the geometry shown. Choose the correct statements about rays 1, 2, 3 and 4.

  

  Select all that apply

  • Option A

    Ray 1 is completely polarized.

  • Option B

    Ray 2 is partially polarized.

  • Option C

    Ray 4 is completely polarized.

  • Option D

    Ray 3 is partially polarized.

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