Chapter 5 Practice Paper: Ray Model of Light — question paper

Section A: Multiple-choice questions[10 marks]

Answer all questions. For each question, write the letter (A, B, C or D) of the correct answer in the brackets provided.

1. 1

   A student measures 40° between a ray and the normal on a flat mirror. The angle of reflection is

   1. A40°, equal to the angle of incidence.
   2. Balways 90°.
   3. C40°, measured from the mirror surface.
   4. Dlarger than 40° because the mirror is smooth.
   ( )
2. 2

   The normal is a line that is

   1. Aparallel to the mirror.
   2. Bthe same as the ray.
   3. Cat 90° to the surface.
   4. Dbehind the image.
   ( )
3. 3

   The word AMBULANCE is painted in reverse on the front of a van so a driver can read it in a rear-view mirror. The mirror property being used is that the image is

   1. Areal and upside down.
   2. Blaterally inverted.
   3. Csmaller than the object.
   4. Dformed on the surface of the mirror.
   ( )
4. 4

   A rough white wall does not act as a mirror because the reflected rays are

   1. Aabsorbed completely.
   2. Bsent back along the normal only.
   3. Cchanged into sound.
   4. Dscattered in many directions.
   ( )
5. 5

   In one material, such as air, the ray model shows light travelling

   1. Ain straight lines.
   2. Bin circles.
   3. Conly through a vacuum.
   4. Dmore slowly than sound in every case.
   ( )
6. 6

   A ray bends when it passes from air into glass because its

   1. Acolour disappears.
   2. Bangle is measured from the mirror.
   3. Cspeed changes.
   4. Dimage becomes real.
   ( )
7. 7

   A ray hits a glass block along the normal. The ray

   1. Abends towards the normal.
   2. Bsplits into a spectrum.
   3. Creflects at 45°.
   4. Ddoes not bend.
   ( )
8. 8

   A shop uses a mirror to see a wide area of the aisle. The mirror should be

   1. Aa plane mirror only.
   2. Bconvex.
   3. Ca glass prism.
   4. Dconcave, like a torch reflector.
   ( )
9. 9

   A prism can split white light into

   1. Aa spectrum of colours.
   2. Ba single ray with no colour.
   3. Csound.
   4. Da magnetic field.
   ( )
10. 10

    An object is 6 cm in front of a plane mirror. The image is

    1. A6 cm in front of the mirror.
    2. B3 cm behind the mirror.
    3. C6 cm behind the mirror.
    4. D12 cm in front of the mirror.
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided. Show your working for calculations.

1. 1

   A laser hits a mirror on a bench. The angle between the laser and the normal is 25°.

   1. (a)

      State how the angle between the reflected laser and the normal compares with 25°.

      [1]
   2. (b)

      Calculate the angle between the reflected laser and the mirror.

      angle =°[2]
   3. (c)

      State the angle between the reflected laser and the normal.

      angle =°[1]
   4. (d)

      A card is held in the path of the reflected laser and a bright spot appears on the card. State what this shows about whether the spot is a real patch of light.

      [1]
2. 2

   A student compares a flat mirror and a sheet of white paper.

   1. (a)

      State the difference between regular reflection and diffuse reflection.

      [2]
   2. (b)

      Explain why the white paper looks bright but does not show a clear image of the lamp.

      [2]
   3. (c)

      State what the straight line with an arrow represents in a ray diagram.

      [1]
3. 3

   Light passes from air into a glass block.

   1. (a)

      Name the process in which a ray bends as it enters a new medium.

      [1]
   2. (b)

      Explain why a ray that is not along the normal bends towards the normal as it enters the glass.

      [2]
   3. (c)

      A second ray hits the block along the normal. State what happens to its direction, and why.

      [2]
4. 4

   Mirrors and outdoor lamps are chosen for a job.

   1. (a)

      State one place a convex mirror is used, and one place a concave mirror is used.

      [2]
   2. (b)

      A stadium floods the pitch with light for an evening match beside a housing estate. State one benefit for the players and one problem for the neighbours.

      [2]
   3. (c)

      Suggest one change that keeps some of the light for people but sends less light into the sky.

      [1]