We can't see ultraviolet ( UV ) light because lens of human eye acts as a physical filter that absorbs it before the light reaches retina.
The cells in retina can detect the light of wavelength about 400 - 700 nm but UV light is just 10 - 400 nm.
So our eye cells just don't react to this light !!!!
Lens of our eye absorbs UV light so that it can protect delicate retina from damage.
Some people who have got their eye lens removed in cataract surgery, can perceive UV light !!!
Bees, birds and some reptiles can detect UV light.
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