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
size (L.O.S.T.) of image in diverging lens
smaller than object
type of image (L.O.S.T.) of image in diverging lens
virtual: rays of light will never meet
