02_07_Div_Lens

# 02_07_Div_Lens - Today 2/7 o o o o Diverging Lenses-Ray...

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Today 2/7 o Diverging Lenses--Ray Diagrams and Math o HW Questions? o Start reading chapter 26.6-8 on Lenses o HW: “2/7 Diverging Lens” (three pages) Due Wednesday 2/12 o Exam I Thursday, Feb 13

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Lenses -- Wave Picture A converging lens bends light toward the axis
Converging Lenses Focal point is the place on the axis where all rays arriving parallel to the axis are directed There is a second focal point on the input side where all rays directed away from it leave parallel to the axis “In through focus-out parallel” “In parallel-out through focus” focal length focal length

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Converging Lens-Ray Diagrams f d 0 object distance image distance d i Now we have to “backtrack” the rays to see where they seem to come from! f = +4cm d 0 = +2cm d i = -4cm h 0 = +1cm h i = +2cm m = +2 (no units)
Equations f d d i 1 1 1 0 = + Thin lens equation 0 0 d d h h m i i - = = Magnification equation f focal length always + for converging lens (- for diverging) d 0 object distance + if on input side d i image distance + if output side (- if on input side) m

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## This note was uploaded on 12/21/2010 for the course PHYS Physics 21 taught by Professor Larrywatson during the Spring '08 term at North Dakota.

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02_07_Div_Lens - Today 2/7 o o o o Diverging Lenses-Ray...

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