the eye and cameras n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
The Eye and Cameras PowerPoint Presentation
Download Presentation
The Eye and Cameras

Loading in 2 Seconds...

play fullscreen
1 / 12

The Eye and Cameras - PowerPoint PPT Presentation


  • 99 Views
  • Uploaded on

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.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'The Eye and Cameras' - terris


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
the eye and cameras

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
Glossary
  • Pupil, iris, cornea, retina, optic nerve, cillary muscles, suspensory ligaments
slide4

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
Task
  • Label your eye diagram using page 220
the eye and lenses a quick recap

The Eye and Lenses – a quick recap.

How can we correct long and short sightedness?

Starter: If I am short sighted I can see things that are …….

focusing on objects
Focusing on objects
  • Close objects – you can only focus on things 25 or more cm away from your eyes.
  • This is the near point – if you are long sighted this gets further away.
  • Far objects – the limit is INIFINITY ….seriously.

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.

lens power what the opticians use
Lens power (what the opticians use)

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!

sight defects
Sight Defects

Short Sighted

Cant see far away.

Image forms BEFORE the retina.

Cause: Eye ball too long OR Lens too thick.

Correction: use a diverging lens.

Long sighted

Cant see close up.

Image forms after the retina.

Cause: lens cannot be made thick enough.

Correction: use a converting lens.

similarities between cameras and eyes
Similarities between cameras and eyes
  • BOTH
    • Use a converging lens
    • Form a real image
    • Invert the image
    • Amount of light can be controlled.