light Flashcards
1
Q
convex lenses
A
refract parallel rays of light inwards (converge) to the principle focus
2
Q
concave lenses
A
refract parallel rays of light outwards (disperse of light)
3
Q
how can lenses work both ways?
A
has principle focus on both sides of the lense
4
Q
what is the distance between the principle focus and the centre of the lens called?
A
focal length
- shorter = more powerful lens
5
Q
how can you make a lens more powerful?
A
- more curved
- different material that natural refract
light more strongly
6
Q
real image
A
light rays actually come together to form the image
7
Q
virtual image
A
formed when the light rays dont come together where the image appears to be
8
Q
red on the spectrum
A
- longest wavelength
- lowest frequency
9
Q
opaque
A
dont transmit any light
- light absorbed
- light reflected
10
Q
transparant and translucent
A
transmit lots of light that hits them
