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16 Cards in this Set
- Front
- Back
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Producing Light
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1. incandescent - glowing wires - only 3% efficient
2. fluorescent - tubes with gas & phosphor lining 3. phosphorescent - phosphor stores the energy and releases it later - glow in the dark 4. bioluminescence - chemical reaction in an organisms body that produces light - photophores - eg. firefly, jellyfish |
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Ray Diagrams
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straight lines
arrows for direction normal |
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Light Behaviour: Refraction
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Refraction - light bends in other materials - translucent/transparent
2 types of refraction Concave - both sides curved in (see sheet) Convex - both sides curved out (see sheet) |
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Light Behaviour: Reflection
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Reflection - light bounces off the material - opaque & shiny
2 types - regular (mirrors) & diffuse Plane mirror - incident ray at same angle from normal as reflected ray (see diagram on sheet) Curved mirror - (see diagram on sheet) |
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Devices: Microscopes
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see other flashcards
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Devices: Cameras
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Optical - old fashioned with film
Digital - PIXELS - more pixels = better resolution - CCD - device/chip that converts light into electrical energy/pulses - Resolution |
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Devices: Telescopes
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Refracting:
- lenses, tube Reflecting: - mirror |
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The Eye: Types
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Camera Eyes
Compound Eyes |
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The Eye: Parts of the eye + camera
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Lens = Lens
Aperture = Iris Film = Retina |
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The Eye: Structure/Parts of the Eye
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cornea, retina, sclera, pupil, optic nerve, lens, iris
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The Eye: Problems
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Near Sighted: can only focus on objects that are close to the eye
IN FRONT OF RETINA Far Sighted: can only focus on objects that are far to the eye BEHIND RETINA |
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EMR - Electromagnetic Radiation
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From most extreme to least extreme:
1. Gamma Rays 2. X-Rays 3. UV Rays 4. Visible Light 5. Infrared 6. Microwaves 7. Radio + TV waves (long wavelength) |
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Wave Model
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Wavelength - measured from peak to peak
Frequency Amplitude - height of wave *long wavelength = small frequency & small energy* |
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Light Facts: Properties
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1. Travels in a straight line
2. Form of energy 3. Can be reflected 4. Travels at a constant speed |
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Light Facts: Colours
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primary colours: red, green, blue
WHEN MIXED secondary colours: yellow, cyan, magenta |
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Light Facts: Sources
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Natural: sun, organisms
Fire Artificial: lightbulbs |
