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03 BEHAVIOUR OF LIGHT

The light is not seen.
We can see only light sources.
The world we live in is visible only because the material reflects light becoming a source of indirect light emission. If the matter
absorb all the light the world would be black and therefore not visible, if the matter is transparent to light we would not see anything except the sun and stars.

Specular:
Every day you look in the mirror (not always willingly). What is the most immediate example of specular reflection.
Specular reflection is given by smooth surfaces that do not absorb light or absorb only a part.
You can also mirror on the metal surface of a car, if the car is red it means that the paint in a non-mirror reflects the red wavelengths but reflects other mirror, allowing us to see our own face reflected.

Wild: . On the edge of the two means, the wave speed and direction change.
An example is looking in a full glass of water containing a straight object, like a pen, partly submerged and tilted, the object appears bent from the water surface.
Each half can only be transparent to some wavelengths but not others such as color filters.



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02 TRICHROMY CITA

The instrument of vision is the eye that receives the primary colors from which mixture you get all the visible colors.
The eye is not sensitive to different colors in the same way. The greater sensitivity to red, slightly lower than for green, while only around 10% of all confidential and sensitive to blue. This is why the yellow (sum of green and red) is the color that seems brighter and the blue light never reaches a comparable and it seems increasingly gloomy.

The primary colors are red, green and blue (RGB Abbreviation for ").


These are contrasted with the secondary or complementary yellow, cyan, and magenta (the English acronym CYM).


Summary additive primary colors, also known as additives, combined together in equal proportions result in white light.

subtractive synthesis: the secondary colors, also known as subtractive, are used in printing. In the paper inks reflect light rather than emit it, keeping the colors from the light incident on a selective basis and making a sort of subtracting the white light.

The best example of the synthesis of color has been applied by the artists dots. Here is a
example of Paul Signac, "View of St. Tropez."
Looking at the image from a distance the landscape is different but when you get closer you notice that it is painted with strokes of color, but by individual points.


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01 COLOR PERCEPTION AND

Matter is not colored.

What is perceived is instead the effect that causes the light interacts with atoms of the objects on which it is radiated.
Most light we see is reflected light.
Light is a part of electromagnetic radiation, thus energy. These radiations are called the visible spectrum.
radiation with shorter wavelength (and therefore higher frequency) are the rays, gamma rays XEI, those with longer (and lower frequency) is infrared (heat), microwaves and radio waves.


Typical light sources are the sun, light bulbs ...

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