Class 8 side - PHY132 Introduction to Physics II Class 8...

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1 PHY132 Introduction to Physics II Class 8 Ray Optics: Chapters 23.5 – 23.7 Optical Instruments: Chapters 24.1 – 24.4 Reminder: Ray Op.cs •Light rays travel in straight lines •Light rays can cross •A light ray travels forever unless it interacts with matter •Light rays originate from every point on an object Thin Lenses: Ray Tracing h h Dispersion The slight variation of index of refraction with wavelength is known as dispersion . Shown is the dispersion curves of two common glasses. Notice that n is larger when the wavelength is shorter , thus violet light refracts more than red light. Diverging Lens Virtual Focal Point Negative Focal length, - f Rays appear to emerge from Virtual Focal Point What happens when diverging rays pass through a Converging Lens? Focal length, f A point source of rays placed exactly one focal length away from a converging lens will produce parallel rays after passing through the lens.
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2 Diverging rays through a Converging Lens Focal length, f s s’ f s s 1 ' 1 1 = +
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