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Unformatted text preview: FNT #6 Beginning lenses August 21, 2005 Question 1 Demonstrate graphically that you only need half a mirror to see your full reflection. Draw where your image is, if it is real or virtual is, and its size (i.e. the magnification). Would standing at different distances from the mirror make a difference? We only see things if they have light coming from them that reaches our eyes. As our feet are the lowest part of our body, we can get an idea of how low the mirror has to be. Instead of guessing how big the mirror is, I will put in a plane mirror and then we shall see which part of the mirror we actually use to see our own image. Let us start with the light rays coming from the feet, shown in green below. Light will be coming from all directions, but only one of those directions will actually be reflected into my eye (reflected rays are shown in red). Let us concentrate on this ray, as it is the one I will actually see Mirror Any part of the mirror below the dotted line I will not have to use. Note the dotted red line. I see a reflected ray and my brain thinks that ray travelled to me in a straight line, so it appears that it travelled from behind the mirror....
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This note was uploaded on 10/22/2010 for the course PHY PHY 7C taught by Professor Staff during the Spring '09 term at UC Davis.
- Spring '09