The Eye and Cameras PowerPoint Presentation
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. ID: 503493Embed code:
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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!!!Slide2
Pupil, iris, cornea, retina, optic nerve,
muscles, suspensory ligamentsSlide3
The role of the eyeSlide4
Light enters through the cornea
Light is focused on the retina where light sensitive cells are.
The Iris controls the size of the pupil – controls how much light enters.
The lens focuses light onto the retina.Slide5
Label your eye diagram using page 220Slide6
The Eye and Lenses – a quick recap.
How can we correct long and short sightedness?
: If I am short sighted I can see things that are …….Slide7
Focusing on objects
– you can only focus on things 25 or more cm away from your eyes
This is the
– if you are long sighted this gets further away.
Far objects – the limit is INIFINITY ….seriously.
of your lens.
If you are close to an object you need a
Lens power (what the opticians use)
Power (dioptre) = 1/focal length in m
e.g. 5.0 = you are long sighted and you have a
A negative value = -1.25 ( that’s what Miss Morris is
) you have a
Miss Morris is
Short SightedCant 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.
: lens cannot be made thick enough.
: use a converting lens.Slide10
Correcting short and long sightSlide11
Similarities between cameras and eyes
Use a converging lens
Form a real image
Invert the image
Amount of light can be controlled.Slide12
Past paper Questions