phy132lab#5

phy132lab#5 - When two thin lenses of focal lengths f 1 and...

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PHY 132 LAB Experiment #5 Thin Lenses Prof. Mahmood Heyrat Purpose

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The objectives of this lab is to observe images formed by various lenses and lens combinations, determine focal lengths of the lenses and lens combinations, and determine transverse magnification. Brief Theory Parallel rays of light near the axis of a lens meet at a point called the principal focus of the lens. The distance from the center of the lens to the principal focus defines the focal length f of the lens. This distance is defined to be positive for a converging lens, and negative for a diverging lens. An object at distance d 0 from the lens will form an image at distance d i from the lens, where d 0 ,d i and f are related by the thin lens equation 1/f = 1/d 0 + 1/d i The transverse magnification is defined as the ratio of the height of the image to the height of the object, which, by similar triangles, should be the same as the ratio of image distance to object distance, m = h i / h o = d i / d o
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Unformatted text preview: When two thin lenses of focal lengths f 1 and f 2 are in contact they form a compound lens whose focal length is given by the compound lens equation. 1/f = 1/f 1 + 1/f 2 . Instruments Two optical bench supports, meter stick, two lens holders, screen support w/ index card, transformer, light bulb & support, two convex lenses, one concave lens, and ruler. Questions 1. The microscope is meant to magnify very tiny objects, whereas a telescope makes the distant objects looks closer. The telescope makes an inverted image while microscope gives the erect image. 2. Conclusion The actual Green that was observed has f 1 =19.5, f 2 =18.72, f 3 =18.72, the calculated G (f 1 = 23.33, f 2 =19.46, f 3 =23.88) turned out to be little be higher than the one was observed. The glass White by itself cannot be observed because it is going to the negative direction, therefore, f 1 , f 2 , f 3 were calculated to be -20, -19.06, -19.06....
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This note was uploaded on 10/23/2008 for the course PHYSICS 132L taught by Professor Heyrat during the Spring '08 term at Cal Poly Pomona.

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phy132lab#5 - When two thin lenses of focal lengths f 1 and...

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