lenses Flashcards
1
Q
what is a lens?
A
a lens is a shaped piece of transparent glass or plastic that refracts light
2
Q
convex lenses
A
parallel light rays that enter the lense converge. they come together at a point xalled the principal focus
3
Q
the distance from the ______ to the principal focus is
A
lens
focal length
4
Q
concave lenses
A
cause parallel rays to diverge
5
Q
what is a real and virtual image?
A
a real image can be projected onto a screen
a virtual image appears to come from behind the lens
6
Q
convex lense the image is
A
inverted
dimnished
real
7
Q
projectors
A
inverted
magnified
real
8
Q
magnifying glasses
A
upright
magnified
virtual
9
Q
concave lenses
A
upright
dimnished
virtual
