Not seeing is not a proof of non-existence

Our eyes can see objects at a magnitude of one fifth of 1mm but it cannot see smaller  ones. In this case, can we deny objects smaller than one fifth of 1mm?

Similarly, man can see rays that have vibrations between 0, 4 and 0, 7. While our eyes can detect rays of this wavelength via the nerves of our retina layer, it cannot see hundreds and even thousands of lights apart from that. X, gamma, ultraviolet, radar, cosmic, x-ray and radioactive rays can be added to this list. So can we deny the existence of all of these rays that we cannot see and can we justified for our denial?

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