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Exposure is a time that telescope spends on a given

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Exposure is a time that telescope spends on a given field of view during single observation. In other words this is the time when the shutter is open andphotons that are falling on a CCD or photographic plate are being detected or counted. Image reproduced from Bubbles, Voids and Bumps in Time: TheNew Cosmology by James CornellAbove you can see two images of the same region of sky taken with two different telescopes and different detectors: photographic plate and CCDchip. What can you deduce about these two detectors? Tick correct answers. (3 attempts)Select one or more:It is always better to observe with a smaller telescope when the CCD detector is used.
9/16/21, 11:06 PMPHYS1160 Activity 4: Attempt reviewThe CCD detector has a superior sensitivity compared with photographic plates or films.
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9/16/21, 11:06 PMPHYS1160 Activity 4: Attempt review11/19QuestionCorrectMark 1.00 out of 1.00SpectraA spectrum is seen when light is decomposed into its constituent wavelengths. An example of a spectrum is a rainbow formed when the light fromthe Sun reflects from the droplets of water in the air.The rainbow can only form if light reflects at the special angle of 42 degrees inside the droplets of water.Another way of forming a spectrum (dispersing light) is passing light through a glass prism.Currently in astronomy large spectrographs use diffraction gratings, which disperse light to form a spectrum.In the image above, what is the function of the mirror at the bottom left that reflects light from the slit to the diffraction grating? (2 attempts)7
9/16/21, 11:06 PMPHYS1160 Activity 4: Attempt reviewSelect one:
12/19InformationYour answer is correct.This is a collimator mirror that makes all the light rays parallel (or collimated). The diffraction grating works best with collimated light and a secondmirror (the camera mirror) then focuses the dispersed light onto the detector.

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Astronomy, Telescopes, Wavelength, Telescope

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