29_lenses - Lesson 29 Lenses Remembering the basics of...

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Lesson 29: Lenses Remembering the basics of mirrors puts you half ways towards fully understanding lenses as well. The same sort of rules apply, just with a few modifications. Keep in mind that for an object to be considered a lens it must be made of a transparent material that has an index of refraction higher than air. That way it will be able to refract the light as it passes through. Also, to get an image that isn't screwed up, we have to assume that the lens is thin. The shape of a lens is named in a similar way to the naming of mirrors, it’s just a little more complicated. All lenses are broken into two broad groups, depending on whether they focus light at a point ( converging lens), or spread it out ( diverging lens). Converging lenses are always convex in shape, which means the centre is thicker than the edges. Diverging lenses are always concave in shape, which means the edges are thicker than the centre. Converging Diverging Double Convex Double Concave Planconvex Planoconcave Convex meniscus Concave meniscus 8/10/2008 © studyphysics.ca Page 1 of 5 / Section 13.4
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When drawing lenses in our sketches, we need to put in a principle axis , just like mirrors. You also need to add in a principle plane , a line that is perpendicular to the principle axis and runs length wise through the middle of the lens. We will be assuming that all refraction
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This note was uploaded on 12/02/2011 for the course PHYSICS 235 taught by Professor Staff during the Fall '08 term at Rutgers.

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29_lenses - Lesson 29 Lenses Remembering the basics of...

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