The Eye and Cameras PowerPoint Presentation

The Eye and Cameras PowerPoint Presentation

2016-12-19 53K 53 0 0

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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: 503493

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Slide1

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

Glossary

Pupil, iris, cornea, retina, optic nerve,

cillary

muscles, suspensory ligaments

Slide3

The role of the eye

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

Slide6

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 …….

Slide7

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

THICK

lens

a

nd

vise

versa.

Slide8

Lens power (what the opticians use)

Power (dioptre) = 1/focal length in m

+

ve

e.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

!

Slide9

Sight Defects

Short SightedCant 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.

Slide10

Correcting short and long sight

Slide11

Similarities between cameras and eyes

BOTH

Use a converging lens

Form a real image

Invert the image

Amount of light can be controlled.

Slide12

Past paper Questions


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