Download Unit 3 Topic 5- Definitions

Unit 3 Topic 4-5
Definitions- Glossary II
Term
page
Definition
accommodation
215
aperture
216
blind spot
217
concave lens
208
convex lens
208
the process of changing the shape of the lens (in
the eye) to adjust for different distances from an
object being viewed
the opening in the diaphragm of a camera; can let
more light reach the film by opening wider
the point where the optic nerve enters the retina;
has no light-sensing cells
a lens that is thinner and flatter in the middle than
around the edges; causes refracting rays to come
together
A lens that is thicker in the middle than around the
edges; causes refracting rays to come together
diaphragm
216
eyepiece lens
221
far point
215
far-sighted
focus
iris
210
210
216
iris reflex
217
lens
208
near point
215
near-sighted
210
objective lens
221
in a camera or microscope, the lens that works as a
magnifying glass to enlarge the image
in a telescope or microscope, the lens that works as
a magnifying glass to enlarge the image
(of the eye) the greatest distance at which an object
is in focus
unable to see close objects clearly
to bring rays of light to a point
in the eye, the coloured ring; works like the
diaphragm of a camera
the natural adjustment in the eye’s pupil size in
response to varying light levels
a curved piece of transparent material, usually
glass or plastic
(of the eye) the shortest distance at which an object
is in focus
unable to see distant objects clearly
the convex lens in a refracting telescope or
microscope
Term
objective mirror
page
221
optic nerve
217
prisms
223
pupil
216
reflecting
telescope
refracting
telescope
221
retina
210
shutter
216
221
Definition
the mirror in a reflecting telescope; also called the
primary mirror
the nerve that connects the eye to the brain
in binoculars, glass blocks serving as plane
mirrors; allow binoculars to be made shorter than
telescopes
the opening in the eye; appears as the dark centre
of the eye
a telescope having a concave mirror to collect rays
of light from a distant object
a telescope having a convex lens to collect and
focus light from a distant object, and an eyepiece
to magnify the image
a light-sensitive area at the back of the eye
in a camera, a device that opens the aperture to
allow light to reach film