The Eye and Cameras . How are our eyes and cameras similar to each other? . Starter: Look at the following optical illusions – what is going on!!! . Glossary . Pupil, iris, cornea, retina, optic nerve, cillary muscles, suspensory ligaments. The role of the eye.
How are our eyes and cameras similar to each other?
Starter: Look at the following optical illusions – what is going on!!!
How can we correct long and short sightedness?
Starter: If I am short sighted I can see things that are …….
To focus, your ciliary muscles change the thickness of your lens.
If you are close to an object you need a THICKlens and vise versa.
Power (dioptre) = 1/focal length in m
+vee.g. 5.0 = you are long sighted and you have a Converging lens
A negative value = -1.25 ( that’s what Miss Morris is ) you have a diverging lens.
Miss Morris is Diverging!
Cant see far away.
Image forms BEFORE the retina.
Cause: Eye ball too long OR Lens too thick.
Correction: use a diverging lens.
Cant see close up.
Image forms after the retina.
Cause: lens cannot be made thick enough.
Correction: use a converting lens.