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Unit F Chapter 2

Light, Microscopes, and Color

What is the difference between a lens and a mirror? A lens allows light to pass through it. A mirror doesn't allow light through it because it reflects all light.
What are some differences between a convex and a concave lens? Convex lens are thicker in the middle and they cause light rays to come together at the focal point. Concave lens cave in at the middle and they cause light rays to spread out in all different directions. Concave lens do not have a focal point.
What kind of lens has a focal point? Convex lens
What is the black part of the eye called? Pupil
Where are images directed once they pass through the lens in the eye? Light images are directed onto the retina.
Once light rays are directed to the retina, how does the image change? The image is inverted or upside down.
After hitting the retina, where is the light information sent in the body? It's sent to the brain to be interpreted.
A person who is near-sighted cannot see...? Far away objects
A person who is far-sighted cannot see...? Near objects
How does an eye-doctor correct a person's vision if they are near or far-sighted? The eye doctor can prescribe glasses or contact lens that redirect the light in the person's eye so that it focuses on their retina.
What is the difference between a simple and a compound microscope? A simple microscope only has one lens, and a compound microscope has two or more lens.
Why are electron microscopes much better than simple or compound microscopes? They use advanced technology and electrons to magnify an object. This is why they are so expensive.
What are the three main colors of light? Red, Green, and Blue
When red and blue light mix and green light is absorbed by an object, what color do we see? Magenta
When green and blue light mix and red light is absorbed by an object, what color do we see? Cyan (light blue)
When red and green light mix and blue light is absorbed by an object, what color do we see? Yellow
What does the term opaque mean? Something that doesn't let light through it. Ex: apple, book, wood
What does the term transparent mean? Something that light passes through. Ex: glass, shallow water
What does the word translucent mean? Something that blurs the light a little bit because it has a "frosty" look to it. Ex: wax paper
When all colors of light (red, blue, and green) are reflected equally by an object, we see what color? White
When all colors of light (red, blue, green) are absorbed by an object, what color do we see? Black
Created by: wahlenm
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