First 3 Paragraphs Flashcards
SIR Isaac newton was the first observed that sunlight separates into bands of bright colors when ?
Projected through a prism
How does the spectrum colors created ?
When the white light ( sun light ) being refracted or separated into this colors
Colours originate from light waves that represent different wavelengths or oscillations of electromagnetic energy
Newton broke up light into its spectral colors and there is young physicist did another experiment by the separated rays of light converge through a lens and so regained the white light what’s does he found ?
any mixture of two or more colors of light yielded a brighter and lighter color leading to white.
For example, the sum of the combi- nation of green and red light yields the lighter color yellow.
What’s the 3 basic colors in light spectrum according to the young ?
red, green, blue-violet
RED GREEN BLUE-VIOLET , this basic colors when mixed what’s does they produce and how we call this 3 colour ?
What’s happen in equal mixture ?
These “primary colors” when mixed can reconstruct most other colors of the spectrum and when all three equally combined yield white.
What’s happen when 2 primary colours get mixed ?
a secondary color is produced.
The secondary color therefore lacks only the third primary color (complementary color) to recompose to white.
What’s additive and substractive colours ?
Additive : light colors ( red , green , blue-violet )
Substractive : opaque colors pigment ( red ,yellow , blue )
What the result of additive and substractive Color mixing ?
Additive : white
Substractive : black
When light rays of different colors are added together to form a mixture how does eyes perceive it ?
as lighter than the original colors that were combined to create it (additive coloration).
colorants like pigments, dye, lacquer, etc., you are dealing with ? And how light react to them when we add them
reflected light
When an artist or dental ceramist works with pigments or dental porce- lains of varying opacities, the amount of light reflected is decreased with the addition of different colors.
How does opaque pigment deal with light ?
absorb or subtract the light waves of all colors but those perceived by the eye.
Each subtractive mixture is darker than the original colors com- bined to create it .
Each pigment absorbs different wave- lengths and increases the absorptive ability of the mix- ture thus decreasing the ?
the reflectance
The three primary colors of opaque pigments (Figs. 2 & 3) act differently when mixed, blending to gray or black.
How does any opaque object around you deal with light ?
receiving light or is receiving the three primary colors red, green, and blue-violet in some ratio.
Some of these objects reflect all of the light they receive and others absorb it almost totally
How does most “opaque” objects deal with light ?
absorbpartially and reflect the rest.
The dominant wavelength reflected back to your eye is the perceived color of the object.
How does white and black papers react to light ?
White paper reflects almost all visible light rays.
Black objects absorb most of the light so nothing is reflected back to your eyes. A perfect black body is basically unchanged by shining light on it.
