UNIT C: EYEBALLS Flashcards
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What was Pythagoras’s theory of light?
Light consisted of beams of light
What contributions did Euclid make to the early ideas about light?
light reflects off a mirror at the same
angle that was shone on it.
What did property of light did Ptolemy describe?
light beams bend when the
go from air to glass.
Why is al-Haytham an important figure in the discoveries about light?
light bounces off objects and travels to the eye.
What did Sir Isaac Newton learn about light?
light is made up of a mixture of different colours.
Who discovered the speed of light and how did he do it?
Albert A. Michelson measured the speed of
light by timing how long it would take to
travel from one mountain peak, bounce off
a mirror on another and come back.
What are the 4 properties of light?
1) Travels in straight lines.
2) Can be reflected.
3) Can bend.
4) A form of energy.
What is an optical device?
Any technology that uses light
Who helped the development of the microscope?
Anton van Leeuwenhoek discovered little animalcules in a pond and led the discovery of a microscope.
What is a microscope?
Microscopes allow you to see great detail by combining the power of two lenses.
What is a telescope?
An optical device that can make you see far away
What did Galileo do to the telescope?
Improve the design that allowed him to discover new things.
What are the two types of telescopes?
Reflecting Telescopes and Refracting telescopes
What is a reflecting telescope?
Large mirror curved inwards and focused to a second mirror then the eyepiece.
What is a refracting telescope?
2 lenses at each end of a telescope. The larger lens (or the objective lens) is the one that gathers light and the smaller lens (or eyepiece) Allows you to see the object.
What are binoculars?
2 refracting telescopes fixed together
What are ray diagrams?
Ray diagrams help to show how light travels.
How does light travel from a source?
A Straight Line called a ray