total internal reflection and critical angle

Question 1

What is the total internal reflection?

Answer 1

the complete reflection of a light ray
- when light is moving from a denser medium towards a less dense one
- instead of being refracted all of the light is being reflected

Question 2

What do endescopes do?

Answer 2

they use their optical fibres to allow the doctor to see through organs in the body
-endoscopes have thousands of optical fibresthat transmit light back up to the doctor