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Heinemann Interactive 2004

Name _________________________________ Class _________________

Coloured objects

Opaque objects appear coloured because they absorb all other colours and reflect only their own colour. An object that appears black absorbs all colours. A white object reflects all colours and absorbs none.

COLLECT ray boxes torches filters coloured cards white board

1. a Shine light onto the coloured cards. b Using your filters, shine different colours onto the cards.

c Observe the new colour of the card. d Put your observations into a table.

2. a Make you own special light effects. b Shine different colours onto a white board. Use any combinations of colours. What are the new colours produced?

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Heinemann Interactive 2004

3. Can you make the board appear white again by using just three colours?

1. What three colours can be used to make white light?

2. Fill out the following:

Red and blue make ______________

Blue and green make ______________

Green and red make ______________

3. If a red light is shone onto a blue jumper, what colour would the jumper appear?

4. Why does a leaf appear green? Which colours are likely to be used for photosynthesis?

5. Research how a rainbow is formed. Write a short report on your findings.

6. A spectroscope is used to split white light into its colours. Find out how a spectroscope works.