Grade 3 Light & optics worksheet

What is on the worksheet

1. Which one lets light pass through so you can see clearly through it: clean water in a glass or a wooden door?

   1. clean water in a glass
   2. a wooden door

2. Which sequence explains seeing a red book in a lit room?

   1. Eye → book → lamp
   2. Book → gravity → eye
   3. Lamp → book → eye

3. You stand outside with the Sun behind you. Where is your shadow?

   1. in front of you
   2. behind you
   3. above your head

4. Which one lets light pass through so you can see clearly through it: clear plastic wrap or a metal pan?

   1. a metal pan
   2. clear plastic wrap

5. Explain why a shadow can move even when the object stays still.

6. How does light travel from a lamp?

   1. in straight lines
   2. only around corners
   3. only in circles

7. Which one makes its own light: a flashlight that is on or a bicycle reflector?

   1. a bicycle reflector
   2. a flashlight that is on

8. Which item normally produces its own visible light when switched on?

   1. An unlit book
   2. A torch
   3. A wooden ruler

9. Which one makes its own light: a firefly or a mirror?

   1. a mirror
   2. a firefly

10. Which one makes its own light: a mirror or a firefly?

    1. a firefly
    2. a mirror

11. Which one lets light pass through so you can see clearly through it: a wooden door or clean water in a glass?

    1. a wooden door
    2. clean water in a glass

12. Which one makes its own light: a firefly or a white sheet of paper?

    1. a firefly
    2. a white sheet of paper

13. Which one lets light pass through so you can see clearly through it: clear window glass or a brick wall?

    1. a brick wall
    2. clear window glass

14. Which one lets light pass through so you can see clearly through it: clear window glass or a cardboard box?

    1. a cardboard box
    2. clear window glass

15. Which material usually lets you see a clear image through it?

    1. Thick cardboard
    2. Clear window glass
    3. A wooden board

16. Which one lets light pass through so you can see clearly through it: clear window glass or a thick book?

    1. clear window glass
    2. a thick book

17. Which one makes its own light: the Sun or the Moon?

    1. the Sun
    2. the Moon

18. A shadow forms when an object does what to light?

    1. It changes the colour of the light to black.
    2. It makes more light.
    3. It blocks the light.

19. Which one makes its own light: a lamp that is switched on or a shiny spoon?

    1. a shiny spoon
    2. a lamp that is switched on

20. Which one lets light pass through so you can see clearly through it: clean water in a glass or a brick wall?

    1. a brick wall
    2. clean water in a glass