How light become important to human life

We are so accustomed with plentiful of light every day till we forget to realize, recognizing, thanking for its role in everyday life. Though without it, there is no color that we can see. And even there might no life at all. Basically, light is divided to visible light and light invisible light. Like the visible light, this invisible light also influencing our life.

Light is a vibration radiation. Everything vibrant that transmits, creep or conduct vibration in the form of wave. When it owns matter (M) hence which is transmitted by is energy. Actually, light do not seen except it has landed in an object. When the object bounces entire light, we catch white light because our eyes accept entire white light's wavelength from its source. As the result, the object looked to be in white chromatic. That's determining color we see.

Black colored object permeate all the wavelength of light, whereas something transparent getting away all light wave which penetrating itself. Colored glass and other materials which are chromatic and transparent, only let certain color penetrating and permeate some of that light again. For the example, red glass which permeate blue light, purple, green, yellow, and orange, but passing the red light.

Light dimension

Everything vibrate according to time dimension ( T=Tempus). All we can see or percept with the five senses because they have dimension ( M=Matter) and space dimension ( L=Longus). Hence human body form referred as other material object have ML2T-2 dimension. While its spiritual form, and also the other which not have items have L2T-2 dimension.
There are 3 type of light which have been recognized globally: physical light, spiritual light, divine light. Physical light generally represent divided electromagnetic wave radiation that become visible light unseen.

Visible Light vibration can be caught by our eyes only one octave from various light octaves which exist in nature. Like do-re-mi-fa-sol-la-si-do, also as light which consist of red, orange, yellow, green, blue, cyan, purple. Human being can hear some color octave, but only one octave can be caught by human sense, which its vibration wave is about 0,4 - 0,8. Lower or Higher from that won't be caught by our eyes, except assisted by other application.
The examples of higher octave are ultraviolet ray ( A, B C) and roentgen ray ( X), cosmic rays and gamma ray. While octave which has lowers frequency is infra-red ray which divided to 3: NIR- Near Infrared Rays, MIR- Medium Infrared Rays, FIR- Far Infrared Rays.

Light and eyes

Sunlight that comes to earth is only the light which can be seen ( visible light), ultraviolet radiation and infra-red radiation. About 37% sunshine radiation represent light which can be seen, 3% ultraviolet and other 60% is infra-red. Because of this visible light so we can see things.
A fold of light energy that enters the eyes and breaks pigment in photosensitive retina nerve cell. This cell then sends its message to brain and brain process it as eyesight. But, there are more unseen light surround us and also more things hidden from our senses.

Eyes are the most sophisticated camera ever has. How eyes accept light and deliver it to brain, same as camera's activity. Diaphragm aperture at camera determines the amount of light which enter, and its result are underexposure or overexposure photo. We are also able to minimize or enlarge eye pupil so that retina get enough light.

We can also focusing retina like us focusing camera to get sharper picture. The difference is when film in camera only used once, we can use retina to make a picture every second and repeatedly even until for our lifetime without have to change it.