Chapter 7 Flashcards
1
Q
Characteristics of light
A
- Form of radiation
- Travels in straight lines
- Transfers energy
- travels as waves
- can travel in a vacuum
- is the fastest thing there is
2
Q
Two laws of reflection
A
angle of incidence = angle of reflection
incident ray, reflected ray and the normal all lie in the same plane
3
Q
rules of images in plane mirrors
A
- laterally inverted
- virtual
- same size
- image appears as far behind the mirror as the object is in front
4
Q
when entering a material the light bends…
A
towards the normal
5
Q
when leaving a material the light bends…
A
away from the normal
6
Q
refractive index =
A
speed of light in vacuum/speed of light in medium
7
Q
speed of light in vacuum =
A
300,00km/s
8
Q
when does total internal relfection occur
A
when the angle of incidence is greater than the critical angle
9
Q
critical angle =
A
sin ^-1 (1/refractive index)
