Waves ch. 1 Optics part 1

1. What is optics: the branch of physics that studies
light.
2. What is the law of reflection: the angle of incidence is
equal to the angle of refraction.
3. What is refraction and where does it take place:
refraction is when light slows down, i.e. when light goes from air into water it slows down and makes an object half in the  water appear bent.
4. Does light travel faster through water than  through air: Light travels faster through water than air or glass.
5. What is one thing Newton did for optics: Newton  discovered that sunlight is made up of coloured beams of light.
6.Herchel discovered that there was invisible light  when he measured the heat of the coloured beams of light. Next to the red beam he found it was the hottest, but no visible light was there.
7. Name three invisible kinds of light: Gamma rays radio waves and infared rays.
8. Why did Newton believe that light was made of particles:  Because shadows are sharp, not blurry, like they would be if lght was made of waves. Particles produce sharp shadows.



Bell