Cornea (does a lot of focusing, high refractive index). Iris (coloured muscle controls the size of the pupil), lens (changes shape by ciliary muscles by the suspensory ligaments)
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What is the far and near point?
Far point - furtherest point an eye can comfortably focus on (Infinite), near point - the nearest point the eye can comfortably focus on (25cm)
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What type of image is formed on CCD's in a digital camera?
A real, inverted (normally smaller than the object) image
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How is short sight corrected?
A diverging lens, diverges the light before it hits the lens in the eye
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How is long sight corrected?
A converging lens, refracts the light, so it converges the light before it enters the eye
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How are lasers used in surgical eye correction?
The lasers cauterize (burn and seal) the blood vessels in the eye (too stop infection and blood loss), the the laser
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How do optical fibres work?
Light bounces off the inside tube (total internal reflection)
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If the angle of incidence is less than the critical angle what will happen?
Most of the light passes out , however come of the light internally relfects
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If the angle of incidence is equal to the critical angle what happens?
The light passes along the surface and a lot of the light is internally reflected
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If the angle of incidence is bigger than the critical angle what will happen?
No light will come out as it is totally internally reflected
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how can you work out the refractive index?
1/sin critical angle
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How do endoscopes allow for keyhole surgery to happen?
One bundle of optic fibres takes light to the area in the patient, another bundle takes the image to a tv screen
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Other cards in this set
Card 2
Front
What is the far and near point?
Back
Far point - furtherest point an eye can comfortably focus on (Infinite), near point - the nearest point the eye can comfortably focus on (25cm)
Card 3
Front
What type of image is formed on CCD's in a digital camera?
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