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Chapter 3 Practice Paper: Light — question paper

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QQ/S4CPH/CH3

Secondary 4 · Combined Science (Physics) (G2 / G3)

Chapter 3 Practice Paper

Light

Duration: 40 minutes
Total: 30 marks
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Class:
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READ THESE INSTRUCTIONS FIRST

  • Answer all questions.
  • Section A: choose the one correct answer for each multiple-choice question.
  • Section B: answer in the spaces provided; show all necessary working.
  • Give numerical answers to 3 significant figures where appropriate, with units.
  • The acceleration of free fall near the Earth is 10 m/s².
  • The speed of sound in air is 340 m/s unless stated otherwise.
  • The use of a calculator is permitted.

Original practice material written for the MOE Combined Science (Physics) syllabus. It is not an official MOE or school examination paper. Chapter 3 (normal and law of reflection; refraction terms; sin i / sin r = constant; refractive index = speed in vacuum ÷ speed in medium; converging lens action, focal length, image characteristics).

For Examiner’s Use
Section A/ 10
Section B/ 20
Total/ 30

Section A: Multiple-choice questions[10 marks]

Choose the one correct answer for each question.

  1. 1

    A ray strikes a plane mirror at an angle of incidence of 40°. The angle of reflection is

    1. A80°
    2. B40°
    3. C50°
    4. D20°
    ( )
  2. 2

    A light ray passes from air into water. It bends

    1. Atowards the normal
    2. Baway from the normal
    3. Calong the surface
    4. Dthrough without bending at all
    ( )
  3. 3

    The speed of light in vacuum is 3 × 10⁸ m/s, and in a glass block it is 2 × 10⁸ m/s. Calculate the refractive index of the glass.

    1. A0.67
    2. B1.5
    3. C5 × 10⁸ m/s
    4. D6 × 10¹⁶
    ( )
  4. 4

    An object is placed closer to a converging lens than its principal focus. The image is

    1. Areal, inverted, diminished
    2. Breal, inverted, magnified
    3. Cvirtual, upright, magnified
    4. Dvirtual, inverted, diminished
    ( )
  5. 5

    For light crossing from air into a medium, sin i ÷ sin r equals

    1. Aa constant for that pair of media
    2. Bzero
    3. Cthe angle of incidence
    4. Da value that changes with the angle
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided. Show all necessary working.

  1. 1

    A ray of light strikes a flat mirror at a point P, making an angle of incidence of 35°.

    1. (a)

      State what the normal is.

      [2]
    2. (b)

      State the law of reflection for a ray striking a plane mirror.

      [1]
    3. (c)

      State the angle of reflection and describe how the reflected ray is drawn.

      [3]
  2. 2

    A ray of light passes from air into glass. At an angle of incidence of 30°, the angle of refraction is measured as 19.5°.

    1. (a)

      Calculate sin i ÷ sin r for this ray.

      ratio =[3]
    2. (b)

      Predict the angle of refraction when the angle of incidence is 45°, showing your working.

      r =°[3]
    3. (c)

      State why the same ratio applies at every angle of incidence for these two media.

      [1]
  3. 3

    Light travels at 3 × 10⁸ m/s in vacuum and at 2 × 10⁸ m/s in a block of glass. A converging lens is ground from this glass.

    1. (a)

      Calculate the refractive index of the glass.

      n =[2]
    2. (b)

      Describe the action of a converging lens on a beam of rays parallel to its principal axis.

      [2]
    3. (c)

      Define the focal length of a converging lens.

      [1]
    4. (d)

      An object is placed far beyond the focal length of the lens. State two characteristics of the image formed.

      [2]

— End of paper —