P4 Physics pg 97
- Created by: Abigail Swann
- Created on: 04-04-13 15:03
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- Diffraction patterns and polarisation
- When waves of equal frequency or wavelength overlap you get interference patterns
- When a wavefront passes through a gap, light from points along the gap diffracts
- The light won't diffracy much if the gap isn't the same size as the wavelength
- The diffracted light from each point interferes with light from all the other points
- Particle theory explains the nature of light - 17th century, 2 theories
- The particle theory of light could explain reflection and refraction
- Thomas Young's experiement showed that light could diffract and interfere
- A coherent light source showing constructive and destructive interference
- Transverse waves can be plane polarised
- Vibrations are at 90 degrees to the directino of the travel of the wave
- plane polarised light is made up of vibrations in one direction
- where the only vertical vibrations is one direction are transmitted
- When light is reflected from some surfaces it is partly polarised
- When waves of equal frequency or wavelength overlap you get interference patterns
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