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“What form of radiation can your eyes detect? sir, please answer this question”
Normal Human Eyes can sense the visible spectrum only.
“The visible spectrum is the portion of the electromagnetic spectrum that is visibleto (can be detected by) the human eye. Electromagnetic radiation in this range ofwavelengths is called visible light or simply light. A typical human eye will respond to wavelengths from about 390 to 750 nm. In terms of frequency, this corresponds to a band in the vicinity of 400–790 THz.” ———– Wikipedia
“why [wiki]water [/wiki]has no colour?”
An object appear coloured or colourless depending on the colours of the spectrum absorbed, transmitted or reflected by it. We see an object in the colour we receive from it. Water allows all the colours to pass through them and therefore we see it as [wiki]transparent[/wiki].
(From another point of view “Water is one of the most essential substance for the existence of water. [wiki]Transparent [/wiki]and colourless appearance of water tels about its [wiki]purity[/wiki].”)