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Author Topic: What's the physical cut of the lenses for x-ray and standard telescope?  (Read 1462 times)

Offline tommya300

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Is there a difference when compairing the cut of the lens for an X-ray telescope and a visible light telescope.
Is there a dramatic difference between the focal lenghts?
Can anyone discribe what the lens for the X-ray telescope looks like?
« Last Edit: 16/06/2010 12:10:33 by tommya300 »


Offline RD

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« Last Edit: 16/06/2010 12:46:42 by RD »

Offline Soul Surfer

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A useful reference but its probably better to include a bit of explanation.  X rays have much shorter wavelengths than light and can effectively pass between the atoms in a solid so the standard sorts of lenses and mirrors do not work with them however because of their high energy the photons can be detected individually so detectors can be very sensitive.  the simplest way to measure the direction of arrival of X rays is to use a collimator bit this needs to be scanned to measure signals from different directions and cuts down the signal a lot.  X rays can be persuaded to reflect from metal surfaces using grazing incidence and imaging telescopes use tis technique and the article referred above shows how this is done.

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