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LENSES: CONVEX AND CONCAVE

Nathan Meyers TED 111

Concave Lenses

Lens that process at least one surface that curves inwards.

A diverging lens that spreads out light waves refracted through it.

Convex Lenses

Convex lens bends light toward a central or focal point.

EYEGLASSES

Lenses help patients to be able to see better through the use of glasses.

Near sighted patients use Concave lenses Far sighted patients use Convex lenses

History from Glasses into Photography

The camera lens evolved from optical lenses developed for other purposes, and matured with the camera and photographic film. In 1568, a Venetian nobleman, Daniel Barbaro, placed a lens over the hole in a camera box and studied sharpness of image and focus. His first lens was from an old man's convex spectacles. The astronomer Johann Kepler elaborated on Barbaro's experiments in 1611 by describing single and compound lenses, explaining image reversal, and enlarging images by grouping convex and concave lenses. (enotes.com)

Photographic Lens

Camera Lens

The camera lens is an invention that tries to duplicate the operation of the human eye.

The purpose of the lens in the camera is to adjust, focus, and transfer the image in color as the picture would appear to the human eye to the camera.

OTHER TYPES OF

LENSES!

LIGHTHOUSES

The Fresnel lens is a lens that is used in lighthouses to aid in the projection of light across seas.

Fresnel Lens

A French physicist named Augustine Jean Fresnel created a lens that would help to travel across the oceans to lead boats to shore. Fresnel’s invention was simply a convex lens that had ridges in it to extend the light and reflect it even further.

The Fresnel lens shot the light across the horizon up to 20 miles which was 97% more powerful than the traditional oil light of the time. The invention of the Fresnel lens saved a lot of power and money and at the same time produced a more powerful signal than before.

Telescopes

Telescopes would not be possible without the use of lenses.

History

The telescope was said to be invented by Galilieo around the 17th century. It was used to view the heavens and learn more about the stars than they knew.

The telescope was said to be the invention of the scientific revolution in the 17th century.

The simple idea of convex and concave lenses (which were invented in the 1300’s) placed in a tube to allow far away objects in a tube was an idea that revolutionized the world that we know today.

Galileo

Galileo Galilei was born on February 15, 1564 in Pisa, Italy. Galileo pioneered "experimental scientific method" and was the first to use a refracting telescope to make important astronomical discoveries

Lens

Through the use of the convex and the concave lenses we are able to have the world that we have today. Without this invention the world would be a dark unknown place. Many great inventions and ideas have sparked from these simple bent pieces of glass. The lens will always have inspirations on the world and its future development and never will go out of style. In my own personal opinion, the lens was one of the greatest inventions in the world because of how beneficial it has been to society and the growth of nations.

Works Cited

http://www.nndb.com/people/925/000100625/ http://

www.enotes.com/how-products-encyclopedia/camera-lens

http://images.google.com/imgres?imgurl=http://www.scienceclarified.com/images/uesc_06_img0342.jpg&imgrefurl=http://www.scienceclarified.com/Io-Ma/Lens.html%3FComments%255Bdo%255D%3Dmod%26Comments%255Bid%255D%3D1&usg=__eQUckdfypSdJdY9Am5fgHoWIwx4=&h=228&w=232&sz=6&hl=en&start=10&um=1&itbs=1&tbnid=EiaLog30ABeVZM:&tbnh=107&tbnw=109&prev=/images%3Fq%3Dconcave%2Blense%26um%3D1%26hl%3Den%26sa%3DN%26rls%3Dcom.microsoft:*:IE-SearchBox%26tbs%3Disch:1

Cont…

http://www.answers.com/topic/lens-1 http://

galileo.rice.edu/sci/instruments/telescope.html

http://www.lucidcafe.com/library/96feb/galileo.html

http://images.google.com/