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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?
(please note that visible light wave is between 400 and 800 nanometers )
1- Gamma Ray. Its length is less than 0.1 of the nanometer, and is considered of the highest power.
2- X-ray. Its wave length reaches up to 1 nanometer and is high in power and can penetrate lots of substances. It is commonly used in the medical field.
3- Ultraviolet ray. Its wave length reaches up to 100 nanometers and is originated from stars explosion, and the sun as well bursts huge amounts of such a ray.
4- Visible light. The length of different waves ranges between 400 – 800 nanometers.
5- Infra-red ray. It length is 0.1 of the nanometer and is usually originated from hot substances and every living being. This ray is used by armies to locate targets of machineries and soldiers that emit heat. Lots of snakes use it to determine their quarries precisely.
6- Short waves or microwaves. These are used in telecommunications (specially in mobile phones), and commonly used heaters. They are used as well in guiding planes, and in determining the speed of traffic on roads.
7- Radio waves. They range between one meter to 1 km in length and are originated from stars as other rays, as well as the lightening processes in clouds, and can be received by radio sets. They are used in wireless telecommunications in general.
“I swear by that you see and by that you do not see.” (69:38-39)
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