Total Internal Reflection

Yet another good video from My GCSE Science

http://www.my-gcsescience.com/revision/separate/total-internal-reflection

Contains information about calculating the refractive index using the sine of the critical angle, describing how optical fibres work and describing the use of lasers.

Specification reference P3.1.5 Other applications of light
You should know that:

• refractive index = 1 / sin c, where c is the critical angle
• visible light can be sent along optical fibres - examples of use should include the endoscope for internal imaging.
• a laser can be used as an energy source for cutting, cauterising and burning (knowledge of how lasers work is not required. Applications should include use in eye surgery)