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UW-Madison PHYSICS 109 - Prism and Converging Lenses

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Physics 109 1st Edition Lecture 3 Outline of Last Lecture I. Refraction of Light a. Snell’s lawII. Total Internal ReflectionIII. Refraction ExamplesOutline of Current Lecture I. The prismII. Converging lensa. 3 easy raysb. lens formula c. magnificationd. finding image sizeCurrent LectureI. The Prisma. When surfaces of block glass or plexiglass are not parallel, as in a prism, the incoming and outgoing rays of light are not parallel. i. When light travels through a prism, the end result is always that the ray is deflected away from the apex of the prismThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.II. Converging Lensa. Converging lens are thicker in the middle than near the edges, so they deflect light toward an axis b. Focal point= the point at which the rays converge at a certain distance from the lensc. 3 easy rays for when the object length > focal length i. A ray from the object through the center of the thin lens. This ray goes straight through because at the center of the lens the two lens faces are parallel to each other. ii. A ray from the object to the lens, parallel to the optical axis. This ray goes through the focal point on the other side of the lensiii. A ray from the object through the focal point on the same side of the lensas the object. This ray will leave the lens traveling parallel to the axis.d. Lens Formula 1/o+1/i=1/f o=lens to object i=lens to image f=lens to focal pointe. Magnification M=i/o i. The bigger the object is the smaller the image is ii. The smaller the object is the bigger the image isf. How to find the image sizei/o (height of the object)g. The image for o>f is real and upside downh. When f<o the image is virtual and upright and the rays are different- see image on next


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UW-Madison PHYSICS 109 - Prism and Converging Lenses

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