Total Internal Reflection
- Created by: ElLiEbUrDeN
- Created on: 22-03-17 22:02
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- Total Internal Reflection
- Angle of reflection = angle of incidence
- Optical Fibres
- Work by bouncing waves off the sides of a thin inner core of glass or plastic
- Very thin glass fibres that are designed to transmit light or infrared radiation
- Waves enter one end of fibre and reflected repeatedly until it emerges at the other end
- The angle of incidence is
- Equal to the critical angle
- Emerging ray comes out along the surface - quite a bit of internal reflection
- Greater than the critical angle
- No light comes out all internally reflected - total internal reflection
- Less than the critical angle
- Most of the light passes out, but little is interanlly reflected
- Critical angle - angle of incidence of a lightray in a transparent substance that produces refraction along the boundary
- Equal to the critical angle
- Occurs when angle of incidence of a light ray in a transparent substance is greater than the critical angle
- Endoscopes
- Thin tube containing optical fibres that let surgeons examine inside the body
- Image can be seen directly or by using a digital camera full - colour moving image on TV screen
- 2 bundle sof optical fibres - one to carry light to the area and the other to carry an image back so it can be viewed
- ADV = surgeons can now perform many operations by cutting small holes - keyhole surgery
- Can only happen when a wave travels through a dense substance e.g. glass/ water towards a less dense substance like air
- Value of critical angle depends on refrective index
- Refractive index - 1/sin c ((critial angle)
- Dense material, hig rereactive index, low critical index, total interanl reflection - move light
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