OCR A Level Physics

Topic Questions

A LevelPhysicsOCRTopic Questions4. Electrons, Waves & Photons4.8 Refraction & Reflection

4.8 Refraction & Reflection

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11 mark

Which of the following statements is/are correct about electromagnetic waves?

1 They can be plane polarised.
2 They can be refracted and diffracted.
3 They have the same speed in a vacuum and in glass.

  • Only 1

  • Only 3

  • Only 1 and 2

  • 1, 2 and 3

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1
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The diagram below shows an optical device constructed from a series of material blocks, each having refractive indices ni (i = 1, 2, 3 …) such that ni + 1 = 2ni. The length of each block labelled x1, x2, x3  ….is chosen so that it takes light an equal amount of time Δt to pass through each block.

I4-8-mcq-h-q1-ocr-al-physics

What is the ratio of the length of the block to the distance travelled by the light in a vacuum in a time equal to Δt?

  • fraction numerator 1 over denominator 2 n end fraction

  • 2 over n

  • n

  • 2 n

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2
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The diagram below shows a ray of light passing straight through the longest side of the right-angled isosceles triangular prism. Upon impact with one of the other smaller sides of the prism, the light ray is reflected towards the third side before being reflected for the final time to pass straight back out of the longest side.

4-8-mcq-h-q4-ocr-al-physics

What is the smallest ratio of the refractive index of the medium that the light enters the prism from no to the ratio of the refractive index of the prism np that will cause the ray of light to totally internally reflect?

  • fraction numerator 1 over denominator square root of 2 end fraction

  • 1

  • square root of 2

  • 2

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1
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A ray of monochromatic light is incident at the boundary between two transparent materials of refractive index n1 and n2. The critical angle θ is equal to 80°.

q15-paper-2-june-2017-ocr-a-level-physics

What is the ratio n subscript 1 over n subscript 2?

  • 0.17

  • 0.98

  • 1.02

  • 5.76

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2
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Refraction of light occurs between two transparent materials P and Q as shown in the diagram below.

4-8-mcq-m-q1-ocr-al-physics

The refractive index of material P is 1.7 and the refractive index of material Q is n.

Which of the following expressions gives the value of n ?

  • fraction numerator 1.7 space cross times space sin space 50 degree over denominator sin space 70 degree end fraction

  • fraction numerator 1.7 space cross times space sin space 40 degree over denominator sin space 20 degree end fraction

  • fraction numerator 1.7 space cross times space sin space 70 degree over denominator sin space 50 degree end fraction

  • fraction numerator 1.7 space cross times space sin space 20 degree over denominator sin space 40 degree end fraction

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3
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A ray of monochromatic light is incident at a boundary between water and air.

The ray is refracted and reflected at the boundary as shown in the diagram.

 4-8-mcq-m-q2-ocr-al-physics

Which of the following statements are true?

  1. The refracted light and incident light have different wavelengths.
  2. The speed of light in air is greater than the speed of light in water.
  3. The angle θ is the critical angle.
  4. The angle ɸ is the angle of refraction

  • 1, 2, 3 and 4

  • 2, 3 and 4

  • 1, 2 and 4

  • 4 only

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4
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The table shows the refractive index n of five transparent materials A, B, C, D and E.

Which material has the largest critical angle?

Material

A

B

C

D

E

n

2.22

1.89

1.50

1.30

1.65

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