Optics Flashcards
(27 cards)
What is a incandescent source of light?
Something that gives off light because of high temperature.
What is a luminescent source of light?
Something that gives off light with little to no heat.
Example of fluorescent light.
Glowing rocks
Example of phosphorescent light.
Ceiling stars
Example of chemiluminescent light.
Glow sticks
Example of bioluminescent light.
fireflies
what is a pinhole camera?
A pinhole camera is a box with a hole on one side and paper on the inside of the opposite side. It projects what’s going on outside the box.
Why do images appear upside down in a pinhole camera?
Light rays enter from the bottom and top going in an angled direction through the whole and since they don’t bend they end up inverted.
Umbra
Part of shadow of where there’s zero light
Penumbra
Part of shadow of where there’s a little light
What are the primary colors of light?
Red, Green, Blue
What are the secondary colors of light?
Cyan, Magenta, and Yellow
What are the complementary colors of light?
Red and Cyan, Magenta and Green, Yellow and Blue
Why do two complementary colors make white?
Because it take two colors to make a complementary color and if you added one it would make white. ( Red, Green, and Blue make white)
Examples of Additive theory
TV and colored printers
How does a human eye detect color?
There are things in the human eye called rod and cone cells. Rods sense movement and intensity. Cone cells sense the actual color.
Does everyone see color the same?
No, some people’s cones in the back of their eyes don’t respond to the light sensed/received.
What are the primary pigment colors?
Yellow, Magenta and Cyan
What are the secondary pigment colors?
Red, Green and Blue
Explain how the subtractive theory works?
It’s when the mixing of colors causes one or more colors to be absorbed or subtracted
Why is black not a color?
Black is not a color because it’s the absence of light
What parts of the electromagnetic spectrum can be harmful, and how?
Ultraviolet rays can damage living tissues and cause sunburn. Gamma rays are radiation and can lead to DNA damage which could lead to cancer. X-rays are stronger than gamma rays and can lead to cancer.
How can parts of the electromagnetic spectrum be helpful?
X-ray are really useful and can determine whether there has been damage to bones or not.
Refraction
Refraction is change in direction of propagation of any wave as a result of its traveling at different speeds at different points along the wave front.
