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Chapter 4 Practice Paper: Thin Converging Lenses — question paper

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QQ/S4PH/CH4

Secondary 4 · Physics (G2 / G3)

Chapter 4 Practice Paper

Thin Converging Lenses

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 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. Converging-lens action, principal focus and focal length, ray-diagram constructions, image nature for objects at different distances, linear magnification, the magnifying glass.

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

    The distance from the optical centre of a thin converging lens to its principal focus is called the

    1. Aprincipal axis
    2. Bfocal plane
    3. Cfocal length
    4. Dlinear magnification
    ( )
  2. 2

    A ray parallel to the principal axis passes through a converging lens and emerges

    1. Athrough the principal focus on the far side
    2. Bstill parallel to the axis
    3. Cthrough the optical centre
    4. Dback along its own path
    ( )
  3. 3

    An object sits 20 cm from a converging lens of focal length 10 cm. The image formed is

    1. Avirtual and magnified
    2. Breal, inverted and the same size
    3. Cvirtual, upright and diminished
    4. Dreal, upright and diminished
    ( )
  4. 4

    When used as a magnifying glass, the lens produces an image that is

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

    A lens forms an image 1.0 cm tall of a 4.0 cm object. The image is 5.0 cm from the lens. The object distance is

    1. A1.3 cm
    2. B0.80 cm
    3. C20 cm
    4. D25 cm
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

  1. 1

    A photographer focuses a camera on a distant tree.

    1. (a)

      State what is meant by the principal focus of a converging lens.

      [1]
    2. (b)

      State two features of the image of the tree formed on the camera sensor.

      [2]
    3. (c)

      Explain why the image is described as real.

      [2]
    4. (d)

      The lens is moved forward so the camera focuses on a nearby flower. State what happens to the lens-to-sensor distance.

      [1]
  2. 2

    A stamp collector uses a converging lens of focal length 6.0 cm as a magnifying glass, holding a stamp 4.0 cm from the lens.

    1. (a)

      State the nature of the image seen by the collector.

      [2]
    2. (b)

      Explain why the image is virtual.

      [2]
    3. (c)

      Name the ray that passes through the lens without changing direction.

      [1]
    4. (d)

      A 2.0 cm emblem on the stamp appears 12 cm tall through the lens. Calculate the linear magnification.

      magnification =[2]
  3. 3

    A projector throws an image of a 35 mm wide slide onto a screen. The image on the screen is 1.05 m wide, and the slide sits 15 cm from the lens.

    1. (a)

      Determine the linear magnification of the stamp.

      magnification =[2]
    2. (b)

      Calculate the distance from the lens to the screen.

      distance =m[2]
    3. (c)

      State two adjustments that would make the on-screen image larger.

      [2]
    4. (d)

      Explain why the slide must be placed upside down in the projector.

      [1]

— End of paper —