Refraction

• Refraction


  The bending of a wave when it travels from one medium to another at an angle of incidence greater than 0°
• Refraction of light


  Light is bent when it travels from one transparent medium into another with a different refractive index at an angle of incidence greater than 0°
• Snell's Law


  For light travelling from one material to another, the ratio sin i/sin r is a constant
• Critical angle


  The angle of incidence which results in an angle of refraction of 90°
• Endoscope


  A flexible tube that uses total internal reflection down optical fibres to illuminate the inside of the body and transmit images back