Laws of Refraction & Total Internal Reflection questions with solutions

Showing 1–10 of 96 questions

• MCQeasyGeometrical opticsLaws of Refraction & Total Internal Reflection

  The electric field of an electromagnetic wave travelling through a medium is given by

  $\vec{E}$(x,t) = 25 sin(2.0 × 10¹⁵t - 10⁷x) n̂

  then the refractive index of the medium is ______.

  (All given measurements are in SI units)

  Options

  • Option A

    1.2

  • Option B

    2

  • Option C

    1.5

  • Option D

    1.7

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  JEE Mains 202628 January Morning Shift

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• MCQmediumGeometrical opticsLaws of Refraction & Total Internal Reflection

  At what angle with the normal (in degree) should a light beam fall on the surface from air to material of refractive index n = 1.732, if the angle of refraction was half the angle of incidence? Assume that the beam is not incident normally.

  Options

  • Option A

    30

  • Option B

    60

  • Option C

    120

  • Option D

    70

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  JEE MainsJEE Advanced

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• MCQmediumGeometrical opticsLaws of Refraction & Total Internal Reflection

  A point source is 12 cm below a water-air surface. Take μ of water=4/3. What is the radius of the circular region through which light can emerge?

  Options

  • Option A

    36/√7 cm

  • Option B

    12/√7 cm

  • Option C

    9√7 cm

  • Option D

    16 cm

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• MCQmediumGeometrical opticsLaws of Refraction & Total Internal Reflection

  A transparent block of refractive index 1.25 is surrounded by a medium of refractive index 1.0. A ray is incident on a vertical face as shown in the original figure. The maximum incidence angle θ for which the ray undergoes total internal reflection at the top surface is:

  

  Options

  • Option A

    tan⁻¹(4/3)

  • Option B

    tan⁻¹($\frac{3}{4}$)

  • Option C

    sin⁻¹($\frac{3}{4}$)

  • Option D

    cos⁻¹($\frac{3}{4}$)

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• MCQmediumGeometrical opticsLaws of Refraction & Total Internal Reflection

  White light is incident on the interface of glass and air as shown in the figure. If green light is just totally internally reflected then the emerging ray in air contains

  

  Options

  • Option A

    yellow, orange, red

  • Option B

    violet, indigo, blue

  • Option C

    all colours

  • Option D

    all colours except green

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• MCQeasyGeometrical opticsLaws of Refraction & Total Internal Reflection

  Statement I: Image formation needs regular reflection and/or refraction. Statement II: The variety in colours of objects around us is due to the contribution of the light incident on them. Choose the appropriate answer.

  Options

  • Option A

    Statement I is correct but Statement II is incorrect.

  • Option B

    Statement I is incorrect but Statement II is correct.

  • Option C

    Both statements I and II are correct.

  • Option D

    Both statements I and II are incorrect.

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• A/RmediumGeometrical opticsLaws of Refraction & Total Internal Reflection

  Evaluate the following Assertion and Reason.

  Assertion

  Assertion (A): Violet light can undergo TIR at an incidence angle for which red light still emerges from normally dispersive glass.

  Reason

  Reason (R): The refractive index of glass is generally larger for violet than for red, so the violet critical angle is 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 opticsLaws of Refraction & Total Internal Reflection

  A coin is at the bottom of a hemispherical container filled with a liquid of re$fractive$ index μ. From the geometry shown in the original figure, the limiting ray reaches the rim with incidence angle 45°. Find the least μ for which the coin is visible to the observer E.

  

  Options

  • Option A

    √3

  • Option B

    √2

  • Option C

    √3/2

  • Option D

    3√2

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• MCQeasyGeometrical opticsLaws of Refraction & Total Internal Reflection

  Assertion (A): The refractive index of glass is greater than that of air. Reason (R): Optical density is directly proportional to mass density, which causes a proportional refractive index. Choose the correct answer.

  Options

  • Option A

    A is false but R is true

  • Option B

    Both A and R are true and R explains A

  • Option C

    A is true but R is false

  • Option D

    Both A and R are true but R does not explain A

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• NumericmediumGeometrical opticsLaws of Refraction & Total Internal Reflection

  A pole is vertically submerged in swimming pool, such that it gives a length of shadow 2.15 m within water when sunlight is incident at an angle of $30^0$ with the surface of water. If swimming pool is filled to a height of 1.5 m, then the height of the pole above the water surface in centimeters is (nw = 4/3) ____________

  Your answer

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