Light waves

1

What type of waves are light?

2

Why are some objects transparent?

3

Which travels most quickly?

4

The angle of incidence always equals what?

5

Why does light refract?

6

What type of lens focuses light on a point?

7

Which of these colours is not found in the spectrum?

8

What are the three primary colours in light?

9

What is the retina?

10

What type of reflection is seen in a mirror?