lenses Flashcards
1
Q
how do lenses form an image?
A
by refracting light
2
Q
what are the two main types of lenses?
A
convex and concave
3
Q
what is the distance from the lense to the principal focus called
A
the focal length
4
Q
a concave lense is wider at the 1.____ than the
2._______
A
- edges
2. middle
5
Q
what types of images can convex lenses produce
A
real or virtual
6
Q
why are convex kenses occasionally called converge lenses
A
due to parallel rays of light entering the convex lense converge
7
Q
what type of images can concave lenses produce
A
only virtual
8
Q
what is the equation to work out magnification
A
image height / object height
