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Chapter 3 Practice Paper: Reflection and Refraction of Light — question paper

QuizQuipPractice Series
QQ/S4PH/CH3

Secondary 4 · Physics (G2 / G3)

Chapter 3 Practice Paper

Reflection and Refraction of Light

Duration: 40 minutes
Total: 30 marks
Name:
Class:
Register No.:
Date:

READ THESE INSTRUCTIONS FIRST

  • Write your name, class and register number in the spaces at the top of this page.
  • Answer all questions.
  • Give numerical answers correct to 3 significant figures unless stated otherwise, with units where a quantity is calculated.
  • A protractor and ruler may be used for ray diagrams.
  • The number of marks is given in brackets [ ] at the end of each question or part question.
  • The total number of marks for this paper is 30.

Original practice material written for the MOE Physics syllabus. It is not an official MOE or school examination paper. Law of reflection, plane mirrors, refraction and sin i / sin r, refractive index, critical angle and total internal reflection, optical fibres.

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 with an angle of incidence of 32°. The angle of reflection is

    1. A16°
    2. B32°
    3. C58°
    4. D64°
    ( )
  2. 2

    Light passes from air into glass. Which quantity stays the same?

    1. Aspeed
    2. Bwavelength
    3. Cfrequency
    4. Ddirection
    ( )
  3. 3

    The refractive index of a medium is 1.5. The speed of light in the medium is

    1. A2.0 × 10⁸ m/s
    2. B3.0 × 10⁸ m/s
    3. C4.5 × 10⁸ m/s
    4. D6.7 × 10⁷ m/s
    ( )
  4. 4

    Total internal reflection can occur when light travels

    1. Afrom air into glass at a large angle
    2. Bfrom glass into air at an angle greater than the critical angle
    3. Cfrom glass into air at any angle
    4. Dalong the normal into any medium
    ( )
  5. 5

    An image formed in a plane mirror is

    1. Areal, inverted and same size
    2. Bvirtual, inverted and magnified
    3. Creal, upright and diminished
    4. Dvirtual, upright and same size
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

  1. 1

    A ray of light strikes a plane mirror at a point where the angle between the ray and the mirror surface is 25°.

    1. (a)

      State the angle of incidence.

      angle of incidence =°[1]
    2. (b)

      State the angle of reflection, with a reason.

      angle of reflection =°[2]
    3. (c)

      Calculate the angle between the incident ray and the reflected ray.

      angle =°[2]
  2. 2

    A ray of light in air strikes a glass block (refractive index 1.5) at an angle of incidence of 40°.

    1. (a)

      Calculate the angle of refraction in the glass.

      angle of refraction =°[3]
    2. (b)

      Describe how the direction of the ray changes as it enters the glass.

      [1]
    3. (c)

      Calculate the speed of light in the glass.

      speed =m/s[2]
    4. (d)

      State what happens to the wavelength of the light in the glass, with a reason.

      [2]
  3. 3

    A student shines light into one end of a long, thin glass fibre. The fibre is gently curved, yet the light still arrives strongly at the far end.

    1. (a)

      Name the effect that keeps the light inside the fibre.

      [1]
    2. (b)

      State the two conditions needed for this effect at each bounce.

      [2]
    3. (c)

      The glass has refractive index 1.5. Calculate the critical angle.

      critical angle =°[2]
    4. (d)

      State one use of optical fibres in medicine and one in telecommunications.

      [2]

— End of paper —