The property of light that allows the functitonality of an endoscope is total internal reflection. Total internal reflection is an optical phenomenon that occurs when a ray of light strikes a medium boundary at an angle larger than a particular critical angle with respect to the normal to the surface. If the refractive index is lower on the other side of the boundary, no light can pass through and all of the light is reflected. The critical angle is the angle of incidence above which the total internal reflection occurs, and is dependant on the optical properties of the two materials. Endoscopes are little else than optical fibers that transmit captured light from one point to another.
light is a eleactromagnetic radiation that has property of waves such as -
1. electromagnetic waves don't require any material medium for their propagation.
2. the electromagnetic waves are transverse in nature.
3. the energy densities of an electromagnetic wave of the electric and magnetic fields of a plane electromagnetic waves are equal.
endoscpoy application is based on the light and the properties of light help play a major role in this application by create a image .
medical application are -
1. laser ,
2. uvr therapy,
3. infra red radition therapy etc.