P3.1- The Eye

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Light converges on the
retina
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Path of rays is changed by the eye by
refraction (carried out by the cornea and the lens)
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Ciliary muscles change the shape of
the lens
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Which keep the image
focussed on retina if the distance alters
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contracted muscles=
loose ligament=lens more rounded= focus on nearby objects
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relaxed ciliary muscles=
lens flattened=focus on distant objects
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Far point is at
infinity
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You need glasses when
the lens doesn't focus the image exactly on the retina
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Myopia is
short sighted
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So...
the image is formed before the retina which leads to a blurred image
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And it's corrected by
a diverging lens- the rays diffract outwards slightly so that the lens focusses on the retina
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Hyperopia is
long sight
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So..
the image is focussed behind the retina qhich also leads to a blurred image
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Corrected by
a converging lens
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For questions involving cameras
the film is the light sensetive thing
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Other cards in this set

Card 2

Front

Path of rays is changed by the eye by

Back

refraction (carried out by the cornea and the lens)

Card 3

Front

Ciliary muscles change the shape of

Back

Preview of the front of card 3

Card 4

Front

Which keep the image

Back

Preview of the front of card 4

Card 5

Front

contracted muscles=

Back

Preview of the front of card 5
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