Optical Images - Formula Sheet E ( x, t ) = E p sin(kx - t...

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Formula Sheet () ( ) 00 11 2 2 2 1 (, ) s i n ( ) 1 sin sin sin p c Ex t E k x t cf k θ = θ n θ =n θ n θ = n ω λ εμ =− == = GG
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PHY 2049C – General Physics B Fields, Circuits, Waves, Light Today: 1) Sign conventions for lens equation 2) The eye and corrective lenses 3) Telescopes and Microscopes
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Sign Conventions for Lens Equation Converging lenses: f > 0 Here: Object left of f: d O >f>0 Image real: d I >0 Image right: d I >0 Image reversed: m<0 111 i I OI O O h d = m = = f dd h d + Diverging lenses: f < 0 Object left: d O >0 Image virtual: d I <0 Image left: d I <0 Image upright: m>0 d O d I d O d I
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Human Eye
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The Human Eye Lens can be contracted, changes focal length ! Normal eye can focus objects from: near Point ~ 25 cm to infinity. a) Lens is relaxed: focus objects at infinity. Cornea – helps focus because it is a curved surface . Retina – Where the image is formed Lens – adjusts the focus by changing shape. b) closer object: contract lens
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Nearsighted Eye
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Farsighted Eye
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Diopters The power P of a lens is given in diopters , and your eyeglass prescription is in diopters.
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Optical Images - Formula Sheet E ( x, t ) = E p sin(kx - t...

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