Total internal reflection

HideShow resource information
  • Created by: Jasmin
  • Created on: 08-04-13 11:42
View mindmap
  • Total Internal Reflection
    • Optical fibres
      • Very thin glass fibres that are designed to transmit light or infrared radiation
      • Work by bouncung waves off the sides of a thin inner core of glass or plastic
      • Waves enter one end of fibre and reflected repeatedly until emerges at other end
    • Can only happen when a wave travels through a ddense substance e.g, glass/water towards a less dense substance like air
    • Angle of reflection = angle of incidence
    • If the angle of incidence is
      • Less than critical angle
        • Most of the light passes out, but little is internally reflected
      • Equal to critical angle
        • Emerging ray comes out along the surface -quite a bit of internal reflection
      • Greater than critical angle
        • No light comes out, all internally reflected = total internal reflection
      • Critical angle = angle of incidence of a light ray in a transparent substance that produces refraction along the boundary
    • Value of critical angle depends on refractive index
      • Dense material, high refractive index, low critical index, total internal reflection - more light
      • Refractive index = 1/sin c (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
      • 2 bundles of optical fibres - one to carry light to area and other to carry image back so can be viewed
      • Image can be seen directly or by using a digital camera full - colour moving image on TV screen
      • ADV = surgeons can now perform many operations by cutting small holes - keyhole surgery
  • Value of critical angle depends on refractive index
    • Dense material, high refractive index, low critical index, total internal reflection - more light
    • Refractive index = 1/sin c (critical angle)

Comments

sophie

fanks

Miss KHP


A really nice mindmap for AQA GCSE science of you need more support on total internal reflection.

Similar Physics resources:

See all Physics resources »See all Light and Optics resources »