optics 2 Flashcards
(10 cards)
What is colour blindness
The ability to only see shades of gray
What is the difference between far sightedness, near sightedness and astigmatism?
Far sightedness is when you can only see far away
Near sightedness is when you can only see close up
Astigmatism is when you eye can not properly focus on an object
What’s the difference between rods and cones
Rods help detect shape and movement in low light
Cones are used to detect colour
Describe the different technologies of optics
Telescope- it was invented by a Dutch spectacle maker Hans lippershey. It provides enlarged images of distant objects
Camera- a lightproof box with a lens at one end to form a real inverted image ona light detector or light sensitive plate or film
Microscopes- instrument used for viewing small objects
Laser- optical device that forms light in which all the light is almost perfectly parallel
Potonics- measured in photons
Describe and name the different sources of light
Incandescent- describes light produced by an object at a very high temperature
Fluorescent-light emitted by some substances web they are exposed to electromagnetic radiation
Phosphorescent-emits light only when under ultralight radiation
Chemo luminescence-light produced by a chemical reaction
Bioluminescence- ability of a plant or animal to produce light
Triboluminescent-producing light from friction
Electric discharge-a method for producing light in which on electric discharge-a method in which a current passes through the air or another gas
Oled- thin layers of organic molecules use an electric current to produce light
Plasma display- tiny fluorescent lights which an electrical signal causes a ga such as neon to release ultra violet radiation
LCD- white light shines behind a liquid crystal
Light tends to travel in..
Straight lines
If you need light to bed you can use..
Optical fibers
What is an optical fiber
A thin transparent glass tube that can transmit light even around corners
What is happening inside an optical fiber?
A long curved tunnel whose walls and ceiling are lined with mirrors. The beam of light changes direction each time it is reflected from a mirror and makes its way to the end of the tunnel
How big is an optical fibre and how many different signals can be transmitted though it.
It can be as thin as a human hair and transmit thousands of different signals at the same time
