Light, the Eye & the Camera Flashcards
What is the retina?
A photosensitive material that contains cells that respond to light (photoreceptors)
What are the 2 types of photoreceptors?
Rods and Cones
Which 2 parts of the eye focus light onto the retina?
Cornea and lens
Rods are sensitive to…
movement and dim light
Cones are sensitive to…
Colors and bright light
What type of reaction happens when light hits the rods and cones?
Chemical reaction (which produce electrical impulses)
What part of they eye sends electrical signals to the brain?
Optic nerve
The iris is…
A muscle that controls the size of the pupil
What is a real image?
Any image you can make on a screen
What is the photosensitive grid at the back of a digital camera?
Pixels
A digital camera is called…
A charged-couple device (CCD)
Red, green, and blue are…
Primary colors
How many colors is white light made up from?
7
What do you use to split up white light into different colors?
A Prism
The spectrum of white light is…
Continuous
Dispersion happens because…
different colors of light are refracted different amounts.
Which color is refracted the most and has a high frequency?
Violet
Which color is refracted the least and has a low frequency?
Red
Light with a _____ frequency is refracted more than light with a _____ frequency.
Higher, lower
When you mix 2 primary colors together, you get…
Secondary colors
To isolate 1 color of light, you need to…
Get rid of all the other colors
What color do you see when white light reflects of a red car?
Red
Why do you only see red when white light reflects off a red car?
The paint absorbs all the other colors except for red.
_____ objects absorb of the colors of light and _____ objects reflect all the colors of light.
Black, white
