Physics 122 2/28/11 Prof. E. F. Redish 1 2/28/11 1 Physics 122 2/28/11 2 Physics 122 3/1/10 3 Physics 122Physics 122 2/28/11 Prof. E. F. Redish 2 2/28/11 4 Physics 122 n1sin1= n2sin22/28/11 5 Physics 122 12mv12+U1=12mv22+U2nmed=vmedc2/28/11 6 Physics 122Physics 122 2/28/11 Prof. E. F. Redish 3 2/28/11 7 Physics 122 2/28/11 8 Physics 122 One side is spherical One side is flat (or spherical) Glass (n > 1) Principal axis: through center of lens, perpendicular to surface, goes through center of the sphere. 2/28/11 9 Physics 122 Light from the object sprays out in all directions. Some of the rays from the object hit the lens, some miss. Those that hit the lens may bend at the surface as it enters and leaves the glass.Physics 122 2/28/11 Prof. E. F. Redish 4 2/28/11 10 Physics 122 Rays coming at the lens parallel to the principal axis are bent so the pass through a single point – the focal point f 2/28/11 11 Physics 122 f Rays that approach the lens through the focal point come out parallel to the principal axis 2/28/11 12 Physics 122 Rays that pass through the center of the lens (at the principal axis) go straight through. They do get shifted a little, but don’t worry about it!Physics 122 2/28/11 Prof. E. F. Redish 5 2/28/11 13 Physics 122 f f All the rays from the point source passing through lens meet at the image point. The principal rays from a point light source (beyond the f.p.) are bent to meet at an image point. 2/28/11 14 Physics 122 oihhfio==+'111i o f 2/28/11 15 Physics 122 1f=1i+1oh'h=ioh > 0 h < 0 i < 0 o > 0 i > 0 o < 0 f > 0 f < 0 “standard” arrangement h´< 0 h´> 0Physics 122 2/28/11 Prof. E. F. Redish 6 2/28/11 16 Physics 122 oihhfio==+'1112/28/11 17 Physics 122 f o i 2/28/11 18 Physics 122 http://www.physics.uoguelph.ca/ applets/Intro_physics/kisalev/ java/clens/index.html http://www.physics.uoguelph.ca/ applets/Intro_physics/kisalev/
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