images in lenses Flashcards
how do we locate images in lenses?
in the same way we locate images in curved mirrors
since light can go through a lens in both directions, there is __________________
a focal point on both sides of the lens
how many light rays are needed to locate an image in a lens?
2
converging lens:
a light ray parallel to the principle axis will go _______________________
through the opposite focal point (F) on the other side of the lens
converging lens:
a light ray that is directed towards the optical centre (O) of the lens will ______________________
maintain its original direction after leaving the lens
converging lens:
a light ray that goes through the focal point (F) (or appears to come from the focal point) will _____________
become parallel to the principle axis on the other side of the lens
location (L.O.S.T.) of image in converging lens
behind lens, beyond F
orientation (L.O.S.T.) of image in converging lens
inverted
size (L.O.S.T.) of image in converging lens
smaller than object
type of image (L.O.S.T.) of image in converging lens
real: the rays of light converge behind the lens
diverging lens:
a light ray parallel to the principle axis will _________________
refract and appear to come from the focal point on the other side of the lens
diverging lens:
a light ray that is aimed at the opposite focal point (on the other side) will __________________
be parallel to the principle axis after refraction
diverging lens:
a light ray that is directed towards the middle of the lens will __________________
maintain its original direction after passing through the lens
location (L.O.S.T.) of image in diverging lens
in front of lens, between F and optical centre
orientation (L.O.S.T.) of image in diverging lens
upright
