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P1 Telescope

QuestionAnswer
Large telescopes which collect visible light to explore the Universe are usually placed near the tops of mountains. Suggest why radio telescopes do not have to be placed high up a mountain.
One theory of the origin of the Universe predicted that there should be cosmic background radiation with a wavelength of about 1 mm. Explain why scientists had to wait until the development of space flight before they could study this radiation in deta
The electromagnetic radiation from most galaxies has a red-shift. Suggest why, when a galaxy has a very large red-shift, some of its visible light is not detected through the Earth’s atmosphere.
What is the role of the eyepiece of a telescope? to magnify the image (to make it larger)
What is the role of the objective lens of a telescope? to create an image inside the tube of the telescope
What happens to a ray of light when it goes from the air inside a piece of glass? The ray bends/changes direction: it is refracted
What happens to the frequency of a ray of light when it goes from the air inside a block of glass?
What happens to the speed of a ray of light when it goes from the air inside a block of glass The rayu of light will slow down
How can you measure the focal length of a convex lens? Get a focused (not blurred) image of a distant object onto a screen. Measure the distance between the lens and a screen.
What can you say of the relationship between focal length and thickness of a convex lens? The thicker the lens,..... The thicker the lens, the smaller the focal length
What is the difference between a real image and a virtual image? The virtual image can not be shown on a screen. A real image can be shown on a screen.
What are the 2 problems with refracting telescopes seeing very far objects? 1)Some of the light of a star will be reflected so the image will be very faint. 2)They need to have very long and/or have large lenses: this leads to the image being distorted
What is the difference between a refracting and a reflecting telescope? The refracting telescope uses lense; the reflecting telescope uses a curved mirror.
Created by: ursulinephys
 

 



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