Refraction, TIR and Dispersion Flashcards
1
Q
What is refraction?
A
The bending of light as it passes through from one medium to the other
2
Q
Behaviour of light while bending
A
- more dense to less dense - away from normal
- less dense to more dense - towards the normal
3
Q
What happens when light travels along the normal (i.e. perpendicular to the surface)?
A
No refraction occurs
4
Q
True or False?
Light rays are reversible.
A
True
5
Q
What are the formulas for refractive index?
A
- n1 sin 01 = n2 sin 02
- n = c/v
- v1/v2 = n2/n1
6
Q
What conditions are needed for total internal reflection to happen?
A
- Light travelling from denser to less dense medium
- angle of incidence > critical angle
7
Q
Formula for critical angle?
A
sin 0c = n2/n1
n2/n1 always < 1
