COLOUR VISION

Question 1

1. What are the 2 types of light sensing photoreceptors that the eye has in the retina?

Answer 1

1. Rods
2. Cones

Question 2

2. Are there more Rods or Cones present in the Retina?

Answer 2

• there are far more rods present

Question 3

3. What are Rods responsible for?

Answer 3

• they are responsible for nigh vision
• they are responsible for peripheral vision
• they are intensity sensing

Question 4

4. Are rods or cones more sensitive?

Answer 4

• rods are a thousand times more sensitive to light than
  cones
• it takes longer for rods to adapt to changing light
  conditions

Question 5

5. What do cones show?

Answer 5

• they show some peculiarities in distribution and in
  sensitivity
• they are colour sensing

Question 6

6. What kinds of wavelengths do cones have?

Answer 6

• there are long wavelength cones
• there are also medium wavelength cones
• these make up 95% of the total cones

Question 7

7. Where are the short wavelength cones found?

Answer 7

• they are scattered
• they are found slightly further out than the long and
  medium wavelength cones

Question 8

8. Which cones are the most sensitive?

Answer 8

• the blue cones
• they are not sensitive enough to compensate for the
  reduced number

Question 9

9. Why is it not recommended to put a red background behind blue text?

Answer 9

• the difference in accommodation needed for the eye to
  focus on the different colours is tiring for the viewer

Question 10

10. What does each of the three varieties of the cones of the Retina come with?

Answer 10

• they each have peak responses
• each of these is in different areas of the visible
  spectrum

Question 11

11. What happens when light of all wavelengths enters the eye?

Answer 11

• all the receptors are stimulated
• the brain interprets this as close to white

Question 12

12. What happens if only some wavelengths are present as they enter the eye?

Answer 12

• the receptors are stimulated in different amounts
• this is what allows the brain to interpret different
  colours

Question 13

13. What is this?

Answer 13

• this is a Chromaticity Diagram
• this shows how any mixture of wavelengths of visible
  light will appear in the eye

Question 14

14. What are the primary colours?

Answer 14

• red
• green
• blue
• this is because the eye responds primarily to these
  lights

Question 15

15. What do mixtures of monochromatic red, green and blue produce?

Answer 15

• almost any colours that the brain can differentiate
  between

Question 16

16. What are the three main Secondary colours?

Answer 16

• Cyan
• Magenta
• Yellow

Question 17

17. What are Secondary colours?

Answer 17

• mixtures of pairs of primary colours of lights
• they can also be the absence of one of the colours
  from white light

Question 18

18. Answer this question.

Answer 18

A

Question 19

19. Answer the question.

Answer 19

B

Question 20

20. Answer the question.

Answer 20

A

Question 21

21. Read through Summary 1.
    Does everything make sense.

Answer 21

• yes

Question 22

22. Read through Summary 2.
    Does everything make sense?

Answer 22

• yes

Question 23

23. Read through Summary 3.
    Does everything make sense?

Answer 23

• yes

Question 24

24. Read through Summary 4.
    Does everything make sense?

Answer 24

• yes

Question 25

25. Read through Summary 5.
    Does everything make sense?

Answer 25

• yes

Question 26

26. Read through Summary 6.
    Does everything make sense?

Answer 26

• yes

Question 27

27. Read through Summary 7.
    Does everything make sense?

Answer 27

• yes

Question 28

28. Read through Summary 8.
    Does everything make sense?

Answer 28

• yes

Question 29

29. Read through Summary 9.
    Does everything make sense?

Answer 29

• yes

Question 30

30. Read through Summary 10.
    Does everything make sense?

Answer 30

• yes