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| Question | Answer |
| what is diffraction? | waves spreading out when they pass through a gap or pass an obstacle |
| what is refraction | change the direction of a wave |
| how would you get the waves to spread out more? | the narrower the gap or the longer the wavelength |
| what happens if the gap is much wider than the wavelength? | little diffraction |
| what happens if the gap is a bit wider than the wavelength? | diffraction only at edges |
| what happens is the gap is the same as the wavelength? | maximum diffraction |
| what happens if a light wave hits the boundary 'face on'? | it carries on in the same direction |
| what happens if a wave meets a different medium at an angle? | the wave changes direction, it's been difracted |
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