Exam #1 Key Words

Exam #1 Key Words - PSC EXAM #1 KEY WORDS Light o o...

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PSC EXAM #1 – KEY WORDS Light o Reflects in all directions from each point of an object o Changes speed when passing thru diff substances: glass, slows Water is approx the same as thin glass – it doesn’t reflect well why we see blurry underwater Tubes, lens o Tubes receive light from only ONE single direction Receptors are on opposite end o Act like prisms Actually a converging one makes more light available o Light bends when it passes thru the lens cuz speed changes Pinhole optics o Discovered by Ibn Al-Haitham o o An eclipse is an example o Should make perfect images, but can’t cuz not enough light can get through Camera obscura o   o   o Refraction o   o   o Converging prism o Lens Makes more light available Photoreceptors o Located in the rods o Send info to ganglion cells Rods o Smaller o Contains photoreceptors
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o Only one type o Sensitive to low light (scotopic vision) o Don’t see color Cones o 3 types of cones: red, blue, green Color corresponds w/ the color of the kind of light they’re sensitive to on the wavelength spectrum  o Phototopic Sensitive to brighter light Compound eye o   o   o Simple eye o   o   o Limpit/patella, amoeba, paramecium o Move away from the light o Move toward the light o Nautilus o Eye works as a pinhole camera Copilia o Has 2 lenses, 2 receptors o “TV of eyes” Scans objects to make the whole image Bee, fly o Compound eyes 1 lens per receptor Squid eyes o Like ours but bigger/better o The eye can be as large as a basketball  o Squid can tell the difference w/ polarized light
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o Has mechanism to get rid of own shadow Human eyes o 2 lenses o 260,000,000 receptors Eye structure o Cornea Most focusing power (fixed) Speed of light here is similar to that in water o Lens  Mainly used for fine tuning o Iris  Has no real purpose o Pupil If it was small enough, we wouldn’t need the lens/cornea Converging light o    o o Optics of the eye o    o o Retina o Complex network of cells that covers the inside back of the eye o Include the receptors that generate electrical signals in response to light as well as the horizontal, bipolar,  amacrine, and ganglion cells Optic Nerve o Bundle of nerve fibers o
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Exam #1 Key Words - PSC EXAM #1 KEY WORDS Light o o...

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