lect5418 - glasses with different indices of refraction....

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Thin Lenses
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Any lens that is thicker in the center than at the edges will make parallel rays converge to a point and is called a converging lens . Lenses that are thinner in the center than at the edges are called diverging lenses because they make parallel light diverge.
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Finding the Image Position Formed by a Thin Lens
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- ray 1 is drawn parallel to the axis; therefore it is refracted by the lens so that is passes along a line through the focal point; - ray 2 is drawn on a line passing the other focal point F’ and emerges from the parallel to the axis; - ray 3 is directed toward the very center of the lens, this ray emerges from the lens at the same angle as it entered.
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Lateral Magnification o i o i d d h h m - = =
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1. You find a diverging (converging) lens in the storeroom and wish to define its focal lens. Describe how you could use two lasers to accomplish this. 2. What type of lens would you use to construct an overhead projector? Explain your reasoning. 3. Two converging lenses with identical shapes are made from
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Unformatted text preview: glasses with different indices of refraction. Which one has the shorter focal length? Why? 4. What type of lens would be helpful in starting of a campfire? Why? Optical Instruments Pinhole Cameras Cameras Our Eyes Normal Eye Lens relaxed, focused at infinity: Lens thickened, focused on nearby object: Correcting eye defects with lenses Test for Astigmatism The Magnifying Glass Telescopes Newtonian Cassegrainian 1. In a refracting telescope, parallel light is collected from a distant source to form a real image that is then magnified by the eyepiece. To achieve high magnification, this real image in located near the eyepiece’s focal point. Use this information to determine how the length of a refracting telescope compares with the focal lengths of the lenses. 2. Sometimes when a person develops a cataract, the lens of the eye is surgically removed and replaced with a plastic one. Would you expect this lens to be converging or diverging one? Explain....
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This note was uploaded on 05/05/2009 for the course PHYSICS 1002 taught by Professor Borovitskaya,elena during the Spring '09 term at Temple.

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lect5418 - glasses with different indices of refraction....

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