None of these option is correct. The most useful ultraviolet telescope would be a 4 meter telescope, in space.
What is an Ultraviolet telescope?
The telescope that is used to inspect the UV portion of the electromagnetic spectrum is called Ultraviolet telescope.
In general, an Ultraviolet telescope looks into spectrum that lies between visible and X-rays segment.
The wavelength of the UV rays is about 400 nm.
Furthermore, this telescope is used above the earth as it can accumulate UV light which make possible the detection of hot objects that do not release visible light.
An UV telescope is an efficient instrument as it can analyze in detail the inner part of galaxies, hot and bright stars, their formation process and so on.
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