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39 Cards in this Set
- Front
- Back
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Producing Light
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Bioluminescence
Fluorescent Incandescent |
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Sources of Light
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Natural- Sun, Fire, Bioluminescence
Artificial- Lightbulbs, combustion |
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Colours of Light
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Primary- Red, green, blue
Secondary- Cyan, yellow, magenta |
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Properties of Light
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-Travels in straight lines which is evidenced by shadows
-Form of energy -Can be reflected -Travels at constant speed |
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Wave Model
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-Wavelength
-Frequency -Amplification |
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EMR/Electro-Magnetic Radiation Spectrum
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High frequency, short waves
Gamma rays X-rays UV rays Visible light (rainbow) Infared Microwaves Radio/TV waves Long waves, low frequency |
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The Eye-Types
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-Compound (insect)
-Camera (human) |
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Eyes comparison to camera
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-Both focus using a lens
-Light gets in in similar ways- a camera with its diaphragm and your eye with the iris and pupil |
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Photoreceptors
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Detect light
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When the light is inside..
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it reaches the photorecopters and the rods that are highly sensitive to light and the cones that detect colour
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Eye problems
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-nearsightedness is when the eye cannot focus on far away objects (focus is in front of retina)
-farsightedness is when the eye cannot focus on near objects (focus is behind retina) |
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Aqueous Humor
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Between iris and cornea. Baths both the cornea and the lens and is replenished by the cillary body
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Choroid
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Supplied blood to the eye. Lies between sclera and retina
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Cornea
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Front portion of sclera that is transparent. Major refractice power of the eye and provides a lot of focusing power as well as protection for eye
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Fovea
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Center of macula, gives the sharpest vision
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Iris
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Front of cillary body. Muscular and pigmented tissues that change the pupil's diameter and how much light gets into the eye
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Macula
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The sensitive, small area of the retina that gives central vision. Contains the fovea
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Optic Nerve
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Connects eye to brain.
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Retina
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Where the light is transferred into electrical waves to be sent through the nerves to the brain.
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Sclera
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Outside covering of the eye. It is the white part of the eyeball. Maintains the shape of the eye and provides firm anchorage for the ocular muscles that control the eye's movement
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Lens
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Focuses a sharp image of an object on the retina.
Provides clear images of objects over a wide range of distances. |
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Vitreous Humor
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A jelly like transparent fluid that fills the inner chamber of the eye.
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Cillary Body
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Muscular tissue that is attached to the lens and controls the tension on these ligaments which alters the power of the lens. Also produces aqueous humor
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Light Behaviour- Refraction
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Bends due to a new substance
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Light Behaviour- Reflection
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Regular (mirror) or diffuse (crinkled, like aluminum)
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Mirrors
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Plane and Curved (concave or convex)
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Lenses
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Concave, convex
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Transparent
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Completley clear
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Transluscent
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Some light
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Opague
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No light
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Pythagoras
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T: We emit light
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Euclid
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T: Light travels in straight lines
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Ptolemy
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T: Light reflects according to laws
Made Law of Reflection |
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Al Haytham
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T: Rainbows, tried to figure them out
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Isaac Newton
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Used prisms to seperate light into colours. Seperated light wavelengths
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Michelson
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Speed of Light measurement. The dude who went on the mountaintops with mirrors
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Telescopes
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Refracting (2 lenses, tube)
Reflecting (mirrors) |
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Cameras
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Optical
Digital |
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Digital Camera
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CCD
Resolution Pixel Light = electrical pulses |
