Traceraysthroughlensesbeginningwithmostupstreamlens

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Unformatted text preview: ys the same: It’s always the same: 111 += S S′ f S′ M =− S You just have to keep the signs straight: s’ is positive for a real image f is positive when it can produce a real image Lens sign conventions S: positive if object is “upstream” of lens S’ : positive if image is “downstream” of lens f: positive if converging lens Mirrors sign conventions S: positive if object is “upstream” of mirror S’ : positive if image is “upstream” of mirror f: positive if converging mirror (concave) System of Lenses • Trace rays through lenses, beginning with most upstream lens Image from first lens Becomes object for second lens System of Lenses • Virtual Objects are Possible !! Object Distance is Negative !! Image from first lens Becomes object for second lens Normal Eye Normal Eye Far­sighted Far­sighted Converging Lens creates virtual image at person’s near point Near­sighted Near­sighted Fix with diverging lens that creates virtual image at far point. Preflight 2 BB A B Farsighted = Converging Lens On...
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