reflection

Question 1

what is total internal reflection?

Answer 1

• incident angle greater than critical angle
  > rays are reflected back into same medium as incident ray
• high to low index interface
• effect of total internal reflection at the cornea
  > light returning from the angle is totally internally reflected within the cornea
• application of total internal reflection at the cornea in other assessment is gonioscopy

Question 2

speculate/regular reflection

Answer 2

reflected light leaves surface in definite bean(follows law of reflection)

Question 3

diffuse/irregular reflection

Answer 3

incident light reflected in all directions(does not follow law of reflection)

Question 4

what is critical angle?

Answer 4

• incident angle that yields refracted angle of 90 degree

- only for high to low index interface