Waves
- Created by: LaurieHunter
- Created on: 19-03-14 16:22
View mindmap
- Polarsing waves
- Can only happen to to transverse waves
- Polarised waves only travel in one direction
- For example, a rope moving vertically can only go through a vertical fence
- A polarising filter only transmits the vibrations in one direction
- If 2 polarising filters are placed perpendicular to eachother, then no light/waves will pass through
- Light reflecting
- Rotating a polarising filter in a beam of light shows the fraction of light that is vibrating in each direction
- When light reflects, it is partially polarised
- if you direct a beam of unpolarised light at a reflective surface then view the reflected ray through a polarising filter, the intensity of light changes with the orientation of the filter
- the intensity changes because the light is partially polarised when it is reflected
- this effect is used to remove unwanted reflections in photography and in polarised sunglasses to remove glare
- the intensity changes because the light is partially polarised when it is reflected
- Rotating a polarising filter in a beam of light shows the fraction of light that is vibrating in each direction
- different materials can rotate the plane of polarisation
- Crystals rotate the plane of polarised light
- rotating the plane of polarisation affects the intensity
- this is Malus's law which states that the intensity of the transmitted light is proportional to the amplitude squared I ∞ cos2θ
- rotating the plane of polarisation affects the intensity
- Crystals rotate the plane of polarised light
- Light reflecting
- If 2 polarising filters are placed perpendicular to eachother, then no light/waves will pass through
- Polarised waves only travel in one direction
- Can only happen to to transverse waves
Comments
No comments have yet been made