Light and Colors

Light vs Pigments If light passes through a substance, the substance is said to be

Light vs Pigments If light passes through a substance, the substance is said to be transparent.

Light vs Pigments If light passes through a substance, the substance is said to be transparent. If light partially passes through a substance, it is said to be

Light vs Pigments If light passes through a substance, the substance is said to be transparent If light partially passes through a substance, it is said to be translucent.

Light vs Pigments If light passes through a substance, the substance is said to be transparent. If light partially passes through a substance, it is said to be translucent. If light will not pass through a substance, it is said to be

Light vs Pigments If light passes through a substance, the substance is said to be transparent. If light partially passes through a substance, it is said to be translucent. If light will not pass through a substance, it is said to be opaque.

An object that produces light is

LUMINOUS

An object that produces light is LUMINOUS An object that reflects light is

An object that produces light is LUMINOUS An object that reflects light is ILLUMINATED

Isaac Newton was the first to show that white light consists of every color light mixed together. He sent white light through a prism, which produced a rainbow of colors and then through a second prism, where it recombined to produce white light again. All the colors, on atop the other, combine to produce white light.

The Primary colors of VISIBLE LIGHT The three primary colors of light are red, green, and blue. (RGB)primary colors Adding two primary colors of light produces the secondary colors of light. Green plus blue produces cyan. Blue plus red produces magenta. Red plus green produces yellow. Red plus green plus blue produces white.

Two colors of light are complementary if they produce white when added together. The complementary pairs are: Green and magenta Red and cyan Blue and yellow

Pigments are chemicals that are used to produce different colors of paint or dyes. The primary pigments absorb ONE primary color and reflect the other two primary colors back to our eyes. The primary pigments are the same as the secondary colors.primary pigments Cyan pigment absorbs red and reflects back blue and green.Cyan pigment absorbs red and reflects back blue and green. Magenta pigment absorbs green and reflects blue and red.Magenta pigment absorbs green and reflects blue and red. Yellow pigment absorbs blue and reflects red and green.Yellow pigment absorbs blue and reflects red and green.

Why does red brick look red?? What color will a green apple appear to be when viewed in red light or green light or blue light or ….??? We SEE the color of objects when light from some light source reflects off them. We only see the colors that reflected. All other frequencies from the light source that are not seen must have been absorbed by the object.

The sky is blue because the atmospheric molecules are in resonance with blue light. The sky is blue because the atmospheric molecules are in resonance with blue light. When white light comes from the sun, the blue waves are absorbed and reemitted in all directions by the air molecules. So the sky will look blue and the sun will have “lost” a little of its blue waves so that it will look slightly yellow (red and green). This is called “Rayleigh scattering”.

The sunrises and sunsets look yellow and orange and red because the white light from the sun has to pass through so much more of the atmosphere to reach our eyes as we look towards the sun at the horizon. Because of that, virtually all of the blue light will have been scattered by the air molecules, leaving only red and green for us to see.

The oceans look blue-green because the ocean waters (with algae and other microorganisms and impurities) absorb red light and only reflect back to our eyes the blue and green of the spectrum.