Science 6 · Unit 6: Light and the Solar System · Cambridge Primary Science Stage 6

Questions

1. 1. What is a plane mirror?

   • a lens
   • a flat mirror
   • a mirror on a plane
   • a curved mirror
   Check

2. 2. What do we call the reflection of your face in a mirror?

   • your normal
   • your shadow
   • your mirror image
   • your incident ray
   Check

3. 3. Which surfaces reflect light best?

   • soft fabric
   • smooth, polished surfaces like mirrors
   • rough dark surfaces
   • black paper
   Check

4. 4. What is the incident ray?

   • the line at 90° to the mirror
   • the ray leaving the mirror
   • the ray of light arriving at the mirror
   • the mirror itself
   Check

5. 5. What is the reflected ray?

   • the normal
   • the ray arriving at the mirror
   • a shadow
   • the ray of light that bounces off the mirror
   Check

6. 6. What is the normal?

   • an ordinary mirror
   • the reflected ray
   • a line drawn at 90° to the mirror's surface
   • the incident ray
   Check

7. 7. How does light reflect from a mirror?

   • at the same angle as it arrives
   • at a smaller angle
   • at a bigger angle
   • straight back every time
   Check

8. 8. An incident ray hits a mirror at 40° to the normal. At what angle is it reflected?

   • 20°
   • 50°
   • 90°
   • 40°
   Check

9. 9. Marcus throws a ball straight down. How does it bounce?

   • it doesn't bounce
   • at 45°
   • off to the side
   • straight back up
   Check

10. 10. Why is clear, still water good at reflecting light?

    • It makes its own light.
    • It is rough.
    • It has a smooth surface.
    • It is dark.
    Check

11. 11. What is a periscope?

    • a light source
    • a device with two mirrors to see over or around things
    • a kind of prism
    • a lens that magnifies
    Check

12. 12. At what angle are the mirrors in a periscope?

    • 90°
    • 45°
    • 180°
    • 10°
    Check

13. 13. In a periscope, which way does the top mirror face?

    • up
    • down
    Check

14. 14. How could you change a periscope to see over a higher wall?

    • remove one mirror
    • make the tube longer
    • angle the mirrors at 90°
    • use smaller mirrors
    Check

15. 15. Why repeat the mirror experiment several times?

    • to break the mirror
    • to use more paper
    • to get more reliable results
    • because the first time never works
    Check

16. 16. What does a man in a submerged submarine use a periscope for?

    • to see the sea floor
    • to see above the water's surface
    • to steer the engine
    • to make light
    Check