Refraction, Reflection & Polarisation (Edexcel A Level Physics)

Exam Questions

50 mins12 questions
1
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1 mark

Which row of the table shows a base quantity and its base SI unit?

  Quantity Unit
A charge C
B  length m
C mass g
D  temperature °C

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    2
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    1 mark

    An object is placed in front of a lens.

    Which row of the table shows a combination that will produce a real image of the object?

      Focal length of
    lens/ cm
    Object
    distance / cm
    A −5 10
    B −5 2
    C 5 10
    D 5 2

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      3
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      1 mark

      A system of lenses consists of a converging lens and a diverging lens in contact.

      The magnitude of the power of the converging lens is 9.4 D and the magnitude of the power of the diverging lens is 4.2 D.

      Which of the following is the power of this system of lenses?

      • 13.6 D

      • 5.2 D

      • –5.2 D

      • –13.6 D

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      4
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      1 mark

      For total internal reflection to take place, the angle of incidence must be

      • greater than or equal to the critical angle.

      • greater than the critical angle.

      • less than or equal to the critical angle.

      • less than the critical angle.

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      5
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      1 mark

      An object is placed 6.5 cm from a lens of focal length 3.9 cm. An image is formed 9.8 cm behind the lens.

      Which of the following expressions is equal to the magnification?

      • fraction numerator 3.9 over denominator 6.5 end fraction

      • fraction numerator 6.5 over denominator 9.8 end fraction

      • fraction numerator 6.5 over denominator 3.9 end fraction

      • fraction numerator 9.8 over denominator 6.5 end fraction

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      6
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      1 mark

      Three polarising filters X, Y and Z, are placed in front of a source of unpolarised light.
      The planes of polarisation of the filters are initially parallel.

      Filter Y is rotated by 45° as shown. 

      q5-june-2019-9ph0-02-edexcel-as-a-level-phy

      Filter Z is then rotated clockwise and the intensity of light emerging from Z is measured.

      Which angle of rotation of Z will result in the lowest intensity of light? 

      • 90°

      • 135°

      • 180°

      • 225°

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