Friday, 11 November 2022


color creation with primary and secondary colors

To do this expérience, we have need a white light as well as 6 different plastic filters which represent the 3 primary colors which are red, blue, green as well as the 3 secondary colors which are magenta, yellow and cyan.

this experiment shows how to create colors with the primary and secondary colors.
To create these colors we put 2 color filters in front of the light which create a new color. Let's take an example, if we put a filter of a primary color like red in front of the white light then a blue filter, when we bring together the blue and red beam we obtain a secondary color which is magenta. Then we do the same with the other primary color and we notice that its creating the secondary colors. Conversely, using the secondary colors gives the primary colors.
We notice that if we gather the beams of light from the three secondary colors we obtain black, conversely if we gather the beams of light from the three primary colors we obtain white

mayana TSTL

Thursday, 10 November 2022

How to make a rainbow?


To make a rainbow we need :a light, a prism and if you want a black cover.For better result go in a dark room. 

To make a rainbow you need to place the black cover in front of the light and place the prism in front of the light. To see the rainbow better you can place a white paper in front of the light. 

To make more than one rainbow you can use a black cover with two or three slit.

This phenomenon appends when the light touch a substance with a different refrative index. 

How to make a rainbow

To make this rainbow we used a white light, a cover with a slit and a prism.
For a better result we did this experience in the dark. The light refracts when it travels at an angle into an environment with a different refractive index and the prism as a different refractive index than the air so when the light shines trough the prism it diffract and make a rainbow.

Wednesday, 9 November 2022



Hello everyone, today I will present additive synthesis of colors with plastic filters. when we add the 3 filters Blue, Red and green the 3 primary colors in physics, we can obtain white light like the sunlight, because the sunlight superimposed all colors that exist. on the picture we add blue filter and red filter in order to obtain magenta color, is secondary color in physics however in painting the magenta a part of primary colors.

in the second picture we add blue filter and green filter in order to obtain cyan, is secondary color in physics but like magenta is primary color in painting.

in the last picture we add red filter and green filter in order to obtain yellow, the secondary color in physics but in painting is like magenta and cyan are secondary colors. So if add primary color filter each other we can obtain secondary color.

Emma and Xan

Colors by Gabriel

Colors by Gabriel


This photo represent the additive synthesis, with primary colors, blue, red and green.


                                  And this photo represent the substractive  synthesis,with the secondary colors, yellow, magenta and cyan

To finish, we have the decomposition of the light, with a prism, and we can see a rainbow.

                                                                                                        Gabriel Marchiset, Terminal STL


Thursday, 29 September 2022

What’s in a degree

 Mister Fahrenheit create the Fahrenheit scale in 1708 with Copernic. The freezing point of water is 32 dégrée Fahrenheit, the boiling point is 212 degree Fahrenheit and thé human body temperature is 99 dégrée Fahrenheit. Fahrenheit is a scientist and he create thermometre, he use mercury for measure liquid.

Wednesday, 28 September 2022

what's in a degree ?

The temperature can be measure in diferents scales, the degrees celsius, the degrees fahrenheit and the degrees kelvin . In degree celsius the boiling point of water is 100 degrees celsius and the freezing point of water is 0 degree celsius, in fahrenheit the freezing point of water is 32 degrees fahrenheit and the boiling point of water is 60 degrees fahrenheit. We can speak about the difference between the body temperatures, in degree celsius is 37 degrees celsius, and in fahrenheit is 96 degrees fahrenheit, but there is a way to translate the degrees fahrenheit in degrees celsius, the degree fahrenheit is equal to degrees celsius multiplie by 5 over 9 in parentheses and plus 32, and to get a degrees celsius in fahrenheit we need to do the next calcul ; fahrenheit minus 30 over 2 and we can get the temperature in degree celsius. We haven't talk about the last scale of temperature, the Kelvin, the kelvin is used by scientist, for have international unity of temperature, in kelvin the freezing point of water is 273 degrees kelvin.