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each his ear whether he is willing or not. The sense of sight vary among people;
someone sees something while another sees something else due to a different variation of
sight, while someone else closes his eyes and sees nothing. For hearing, we all share the
same sound, if we are assembled in one place. Hence eyes vary but ears stand single.
What we see and what we do not ..!
• Are there really things around us that we cannot see?
• A quick look to the nature of light, being the tool of vision and sight, can help
bring home the idea.
• • There is a difference between visible light and light in general.
• • Light scale in general starts with less than 0.1 of the nanometer,
as in the case of rays of short wave and high power (Gamma rays),
up to more than 1 km, as in the case of long waves and low power
(Radio waves).
• • Visible light is the light waves that man’s eyes can receive and
through which he can see things. This has no significant rate in the
wave length scale of light or in electromagnetic waves, where normal
light waves with its seven known colours reach a rate of 400 and 800
nanometers (nanometer is one thousand-millionth of a meter) on the
scale grade.
• • Man with the help of visible light can see all around, as he can
see microorganisms through microscopes and far celestial bodies
through telescopes. Man was not able before the discovery of these
two instruments to see more than his open eye could see. Man can
presumably see all that which can be seen by visible light, regardless
of being minute or huge. This gives the room for the question: what
about other unseen worlds?
• • What is the volume of these visible things in the direct light waves
in comparison with the things that cannot be seen or perceived by the
human eye?