S5 - Physics Unit 2 Flashcards
1
Q
What is refraction?
A
The change in velocity and wavelength of light as it enters another medium
2
Q
What happens to the frequency when light enters another medium?
A
Nothing
3
Q
What are the blanked out words?
A
4
Q
What is the symbol for the refractive index?
A
n
5
Q
What units does refractive index have?
A
None
6
Q
What is a critical angle?
A
An angle at which light neither reflects nor refracts
7
Q
What angle does light leave a material at when it’s at its critical angle?
A
90°
8
Q
What is ‘total internal reflection’?
A
When the incident angle is greater than the critical angle and the light reflects within the material
9
Q
What are some uses of total internal reflection?
A
Transmitting internet signals through fibre optic cables
