physics grade 10 Flashcards
lens that corrects near sightedness
concave
lens that corrects farsightedness
Convex
How do rainbows form
Sky is filled with water droplets
Sunlight enters the water droplet and refracts towards the normal
Two refractions result in a dispersion of the light
Image is a virtual image because your brain projects these refracted light rays backwards and forms a virtual image of the visible spectrum
The colours in a rainbow all come from different droplets
Only happens when the sun is behind you
Concave lenses
Diverging lenses
Convex lenses
Converging lenses
S,I,R used for
Cameras
L,I,R used for
Movie projectors
L,U,V used for
Magnifying glasses
DO
Is always positive
DI
+ for real
- for virtual
F
+ for converging
- for diverging
HI
+ if upright/ virtual
- if inverted/real
M
+ if upright
- if inverted
Refraction
The fact that light bends and is not straight
What is c in n=c/v
3x10^8
Apparent depth
As light shines off the object it speeds up when it enters air and bends away form the normal. We assume light travels in a straight line so we think that the object is farther away then it really is.
View diagram
Critical angle
The refracted ray of light follows a path exactly along the surface of the water
Total internal reflection
When light reflects completely off the inside wall of a denser medium rather then passing through the wall into a less dense medium
Dispersion
Is the refraction of white light into separate wavelengths or colours
