2.6 refraction Flashcards
(5 cards)
1
Q
refractive index of air
A
1.00
2
Q
when light bends to a more optically dense medium does it bend towards or away from the normal
A
towards
3
Q
when does total internal reflection occur
A
- angle of incident must be greater than the critical angle
- incident ray is in the more optically dense medium
4
Q
what is the purpose of cladding in a step index optical fibre
A
- allows TIR as it has a lower refractive index than the core
5
Q
what path does a light ray take when the angle of incidence
A
it goes along the boundary ie the angle of refraction is 90
