Level 5 Level 7
Level 6

LENSES


18 words 0 ignored

Ready to learn       Ready to review

Ignore words

Check the boxes below to ignore/unignore words, then click save at the bottom. Ignored words will never appear in any learning session.

All None

Ignore?
diverging lens
short sighted eyes corrected with...
converging lens
long sighted eyes corrected with...
25cm
near point of normal eye
infinity
far point of normal eye
lens
To focus light onto the photosensitive surface at the back of the camera. This can either be photographic film or a CCD (charge-coupled device).
Focusing screw
Allows the user of the camera to adjust the focus for nearer or more distant objects.
Aperture
Allows the user of the camera to adjust the amount of light entering the camera in different light conditions
Photosensitive surface
Detects and records the light which is focused onto it. This can be on photographic film, but digital cameras use CCDs which convert light into electrical signals which can be stored.
cornea
Front part of the tough outer coat, the sclera. It is convex and transparent
iris
Pigmented - decides the colour of your eyes - so light cannot pass through. Its muscles contract and relax to alter the size of its central hole or pupil.
lens
Transparent, bi-convex, flexible disc behind the iris attached by the suspensory ligaments to the ciliary muscles.
retina
The lining of the back of eye containing light sensitive cells
Optic nerve
Bundle of sensory neurones at back of eye.
cornea
refracts light - bends it as it enters the eye
Iris
controls how much light enters the pupil
lens
focuses light onto the retina
Retina
contains the light receptors
optic nerve
carries impulses from the eye to the brain