Shared Flashcard Set

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Pages 18-21
Section 3 Chapter One
7
Science
7th Grade
09/20/2010

Additional Science Flashcards

 


 

Cards

Term
Electromagnetic Spectrum
Definition
Made up of all the lengths of electromagnetic radiation.
Term
Telescope
Definition
An instrument that collects electromagnetic radiatioon from the sky and concentrates it for better observation.
Term
The bigger the objective lens, what hapens?
Definition
More light is gathered.
Term
-Without a telescope how many stars can you see?
-With a telescope how many stars can you see?
Definition
-6,000 stars (at night)
-millions of stars
Term
What is an objective lens?
Definition
a lens that collects light and forms an image at the back of the telescope.
Term
refracting teloescopes
Definition
telescopes that use a set of lens to gather and focus light.
Term
reflecting telescopes
Definition
telescopes that use curved mirrors to gather and focus light.
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