Prisms & Thin Prisms questions with solutions

Showing 1–10 of 121 questions

• MCQmediumGeometrical opticsPrisms & Thin Prisms

  Two equal-angle thin prisms of 5° are oppositely oriented. One has μ=1.50. Net deviation is 0.5° toward the second prism base. The second prism index is:

  Options

  • Option A

    1.40

  • Option B

    1.50

  • Option C

    1.60

  • Option D

    1.70

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  JEE MainsNEET

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• Multi-correctdifficultGeometrical opticsPrisms & Thin Prisms

  For a prism of angle θ = 60°, the refractive indices of the left and right halves are n₁ and n₂ (n₂ ≥ n₁), as shown. The incidence angle i is chosen so that the ray has minimum deviation when n₁=n₂=n=1.5. For n₁=n and n₂=n+Δn, where Δn << n, the emergence angle is e=i+Δe. Which statement(s) is/are correct?

  

  Select all that apply

  • Option A

    Δe (in radians) is greater than Δn.

  • Option B

    Δe is proportional to Δn.

  • Option C

    Δe lies between 2.0 and 3.0 milliradians if Δn = 2.8 × 10⁻³.

  • Option D

    Δe lies between 1.0 and 1.6 milliradians if Δn = 2.8 × 10⁻³.

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  JEE Advanced 2021

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• MCQmediumGeometrical opticsPrisms & Thin Prisms

  For refraction through a prism at minimum deviation, consider the statements: (A) the refracted ray inside the prism becomes parallel to the base; (B) a larger prism angle necessarily gives a smaller minimum deviation; (C) angle of incidence equals angle of emergence; (D) except at the minimum-deviation setting, there are generally two incidence angles giving the same deviation; (E) the angle of refraction becomes double the prism angle. Choose the correct set.

  Options

  • Option A

    B, C and D only

  • Option B

    A, B and E only

  • Option C

    A, C and D only

  • Option D

    B, D and E only

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  JEE Mains 2025 3 April Morning Shift

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• MCQmediumGeometrical opticsPrisms & Thin Prisms

  A 60° prism has μ=1.50. At miniμm deviation, the incidence angle is closest to:

  Options

  • Option A

    30°

  • Option B

    40°

  • Option C

    48.6°

  • Option D

    60°

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  JEE MainsNEET

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• A/RmediumGeometrical opticsPrisms & Thin Prisms

  Evaluate the following Assertion and Reason.

  Assertion

  Assertion (A): Immersing a glass prism in a liquid of lower refractive index than glass reduces its miniμm deviation compared with air.

  Reason

  Reason (R): The refractive index of the prism relative to the surrounding medium becomes smaller.

  Options

  • Option A

    Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

  • Option B

    Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.

  • Option C

    Assertion is true, but Reason is false.

  • Option D

    Assertion is false, but Reason is true.

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• MCQmediumGeometrical opticsPrisms & Thin Prisms

  A prism of angle 30° produces a miniμm deviation of 10°. Which value is closest to the refractive index of the prism?

  Options

  • Option A

    1.321

  • Option B

    1.471

  • Option C

    1.201

  • Option D

    1.621

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• Multi-correctmediumGeometrical opticsPrisms & Thin Prisms

  A ray passes through a prism at a deviation greater than the miniμm deviation. Which statements can be correct?

  Select all that apply

  • Option A

    Two different incidence angles may give the same deviation

  • Option B

    The two corresponding paths can be reverses of each other

  • Option C

    At the miniμm of the δ-i curve, i=e

  • Option D

    Every incidence angle gives the same deviation

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  JEE MainsNEET

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• MCQmediumGeometrical opticsPrisms & Thin Prisms

  A prism has refractive index 1.50. What is the miniμm prism angle for a ray entering normally through the first face to undergo TIR at the second face?

  Options

  • Option A

    sin⁻¹(2/3)

  • Option B

    30°

  • Option C

    60°

  • Option D

    sin⁻¹(3/2)

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  JEE MainsNEET

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• MCQmediumGeometrical opticsPrisms & Thin Prisms

  The refractive index of the material of a prism is √2 and its refracting angle is 30°. One of the two refracting surfaces of the prism is made a mirror inwards by silver coating. A beam of monochromatic light entering from the other face will retrace its path, if its angle of incidence on the prism is:

  Options

  • Option A

    30°

  • Option B

    45°

  • Option C

    60°

  • Option D

    Zero

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  NEET 2018AIPMT 2004NEET Previous Year

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• A/RmediumGeometrical opticsPrisms & Thin Prisms

  Evaluate the following Assertion and Reason.

  Assertion

  Assertion (A): A ray entering normally through the first face of a prism can undergo TIR at the second face.

  Reason

  Reason (R): For normal entry, the internal incidence at the second face equals the prism angle A.

  Options

  • Option A

    Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

  • Option B

    Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.

  • Option C

    Assertion is true, but Reason is false.

  • Option D

    Assertion is false, but Reason is true.

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  JEE MainsNEET

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