Light penetration

Question 1

what causes colour?

Answer 1

• wavelength of light reflected

Question 2

How does spectrum change with depth?

Answer 2

• red light absorbed
• scattering/reflection (poor depth penetration)

Question 3

What other factors affect the penetration and spectrum of light?

Answer 3

• turbidity
• dissolved substances

Question 4

What is turbidity? give an example

Answer 4

• particles in water
• ex. algae, absorb blue + red (reflect green)

Question 5

Why are fish dark at depth?

Answer 5

• no red light, costs to pigmentation