Glasses exhibits large optical transparent window covering UV, Visible and IR regions...May I know what they intended to say
I believe they simply mean the glass has a high transmission coefficient (close to 100%) for light with energies in the IR, visible and UV wavelength ranges.
high transmisssion coefficient means no absorption. What is the significance of it
It's simply a property of the material. It will be significant if that property is important for the application. For instance, some glasses may absorb X-ray wavelengths but be transparent to visible light, meaning they may be suitable to be used for X-ray spectroscopy in a UHV chamber where it's important for you to be able to see through it (e.g. to manipulate a sample) whilst being protected from X-ray radiation. The context will dictate the significance of that property. In another example, if you wanted to use a material as part of a solar cell (e.g. a protective layer), you need that material to let as much light through otherwise it will inhibit the solar cell.
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