Refraction and Diffraction

Question 1

What is diffraction?

Answer 1

Waves spreading out when they pass through a gap pass an obstacle.

Question 2

What is diffraction affected by?

Answer 2

The size of the gap relative to the wavelength the wave.
If the gap is much wider than the wavelength = little diffraction.
If the gap is a bit wider than the wavelength =diffraction only at edges.
Gap the same as wavelength= Maximum diffraction

Question 3

What is refraction?

Answer 3

If a wave meets a different medium at an angle, the wave changes direction, this is refraction.