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You know that light can be refracted, or
bent.lenses are used for bendirig light.
They can make objects look smaller or
larger. They can make things that are far
away look clase. How do lenses work?Lenses are made of glass or other
materials that light can pass through. The
.two main kinds of lenses are concave
lenses and convex lenses. A concave lens
listhinner in the middle than it is at the
edges. A concave lens bends light rays so
.that they spread aparto A convex lens is
thicker in the middle thaM it isat the
edges. A: convex lens bends tlght rays so
i that they come together.
; Lenses have many different uses.
'People who havetrouble seeing wear
Ieyeglasses or contact lenses. Eyeglasses
I are lenses worn in front of the eyes.
) Contact lenses are lenses worn on the
eye. Contaet lenses are made ofplastie.
zConcave lenses help people who have
r trouble seeinf)objects in the distanee.
: Convex lenses help people who have
.trouble seeing objeets clase tothem.
; Scientists use lenses in microscopes.
tThe lenses in microscopes make very tiny
,objects look larger. Scientists use
{mieroscopes to study things thatare
)normally too small to see. Scientists also
use lenses in telescopes. Telescopes make
Haraway objects look as if they are closer.
3Scientists usetelescopes to study stars
rano planets.
5 Lenses are used in eameras. They focus
Iight on the film. Without lenses, there
1would not be photographs or movies!