Quiz Review (Vision, Light and Colour)

Science 8 Name:______

1. Write the names for the parts of the eye next to the correct letter in the table.

a
b
c
d
e
f
g

2. Write the names for the parts of the eye next to the correct definition in the table.

“hole” in the iris where light enters
area where image forms and is made into a nerve signal
helps focus light onto the retina
carries nerve signals to the brain
controls the thickness of the lens (to focus)
outer layer that helps focus light onto the retina
makes the pupil larger or smaller (where your eye colour is located

3. Answer each question in complete sentences.

a. How do your iris and pupil control the amount of light entering the eye?

b. Why does your pupil appear black?

c. Where does refraction occur in the eye?

d. How do your ciliary muscles and the lens help you focus on near and far objects?

e. What are the two special types of cells in your retina that detect light?

f. How are the two types of cells different? (What does each do?)

4. Label the diagram below with the primary and secondary colours of light. If you wish, you may colour with markers or colour pencils.

5. Explain why white is at the center of the diagram above.

6. Why do humans only need three primary colours of light to see white light?

7. List the three combinations of primary light colours that make each secondary light colour.

8. Define complementary light colours.

a. What colour of light is complementary to green?

b. What colour of light is complementary to cyan?

9. Define colour blindness.

10. Explain what is meant by a primary PIGMENT colour. How is it different from a primary colour of light?

11. List the three primary PIGMENT colours and what colour of light is absorbed by each.

12. A red object appears red because it absorbs all the other colours of white light, but only reflects red. We observed that you see colour of objects differently if you do not shine white light on the object, using filters.

a. What colour would you see if you shone cyan light on a magenta object? (What colour from the cyan light would not be absorbed?)

b. What colour would you see if you shone yellow light on a red object?

c. What colour would you see if you shone red light on a blue object?