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# Convex and Concave Lenses

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## Zac Nickel

on 2 June 2014

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#### Transcript of Convex and Concave Lenses

Convex and Concave Lenses
Zac Nickel
Physics 20
Mr. Andrie
Concave Lenses
Concave lenses are lenses that are curved inwards like a cave. They have thinner sides than their middle and are sometimes called diverging lenses. When light hits the lens, it refracts, causing the light to separate into different paths.

Convex Lenses
Convex lenses are lenses that are curved outwards like a ball. They have thicker sides than their middle and are sometimes called converging lens. When light strikes the lens, it refracts, causing the light to meet at a certain point. A magnifying glass would be a good example of a convex lens.
Refraction

Refraction is causing light to bend. The refraction of light is caused when light passes through an object. The object has a different density than what the light was just in. This causes the light the bend and makes things look different from what they actually are.

Virtual and Real Images

Virtual and real images are what we see when we look into a lens.Virtual images are larger and behind the lens. Real images are created in front of the lens and are smaller when in front of double the distance of the focal point and larger when between the focal point and double the focal. Real images are also inverted where virtual are right side A convex lens will create either a real image or a virtual image where a concave lens will always create a virtual image. A real image is created with a convex lens when the image is outside of the focal point as the light rays converge in front of the lens. If the image is inside the focal point, then the light rays appear invisible to the eye and cannot be seen. If the image is within the focal point, they will create a larger image behind the mirror which will be virtual.
Concave lenses are used in many things in day to day living. A good example of this is in glasses. A person will wear concave lenses in their glasses to correct near sightedness. It causes the object that the person is looking at to appear smaller and farther away as it stretches the rays farther back so that the focal point rest on your retina. Concave lenses are also used in door holes. These small lenses allow people to see outside of their room with a wider range of view. Where someone would only see their visitors chest, the lens allows a whole person to be seen. It works by taking light and refracting it so that it so that a wider range can be seen. Flashlights are another example of how you can use a concave lens. They take the rays of light that the flashlight produces and refracts them so that it can cover a larger area. It scatters the light more which illuminates more as the rays can travel farther apart.
Convex lenses are commonly found in day to day life. A prime example of this is in magnifying glasses. A magnifying glass uses the convex lenses to make an object look larger and closer by focusing the rays of light on a closer focal point. Convex lenses are also used in reading glasses or glasses for people with far sightedness. They take the image and make it seem closer and larger and pull the light rays in so they rest upon the persons retina. A third use for a convex lens is in microscopes. It works in a microscope at an incredible scale. It causes the tiny objects to appear incredibly closer and larger. It takes the light rays and makes the focal point sot it is a lot closer to the lens causing the image to appear larger and closer.
Biography
Physics 20 Text Book
http://www.pa.msu.edu/courses/2001spring/PHY232/lectures/lenses/virtual_image.gif
http://www.pa.msu.edu/courses/2000fall/PHY232/lectures/lenses/real_image.gif