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Applied Physics and Chemistry Refraction Lecture 5

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Refraction Definition: Bending light due to change in speed Index of refraction: Relative amount that the material bends light Ratio of speed of light in medium compared to speed in a vacuum

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Lenses Lens is: Curved transparent material that bends light to a focus Light bends toward thickest part Two kinds: Concave Convex

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Concave Lenses Lenses that are thicker at the edges and thinner in the center. Diverges light rays All images are erect and reduced. The De-Magnifier

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Concave Lenses Two rays from top of object define image location http://homepage.mac.com/cbak ken/obookshelf/ccimages.html

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Equations All lenses obey the same equation 1/do + 1/di = 1/f f is negative for concave lens di is also negative Magnification: hi/ho = di/do

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Example Joe bought a concave lens having a focal length of -10 cm. He placed a lighted object 30 cm in front of the lens. Where will the image be formed? What type of image will it be? What we know: f = -10 cm Do = 30 cm Di = ? Equation: 1/f = 1/Do + 1/Di Solve: 1/Di = 1/f - 1/Do = (1 / -10 cm) - 1 / 30 cm = -4 / 30 cm = -0.1333 cm-1 Di = -7.5 cm The image is upright, reduced and virtual

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8. Thin lenses Thin lenses are those whose thickness is small compared to their radius of curvature. They may be either converging or diverging. 1) Types.

8. Thin lenses Thin lenses are those whose thickness is small compared to their radius of curvature. They may be either converging or diverging. 1) Types.

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