Siena PHYS 120 - Optical Instruments (4 pages)

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Optical Instruments



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Optical Instruments

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Pages:
4
School:
Siena College
Course:
Phys 120 - General Physics IIA

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Optical Instruments Ch 25 Human Eye Could easily take an entire course We will focus on a few CT Scan corrective lenses rods cones human eye Microscope Telescopes fovea limits of resolution 1 Human Eye Image rate 30 sec Ciliary muscles Near point Physics 120 2 common defects caused by size of eye or shape of cornea most happens at cornea n 1 376 lens n 1 386 1 406 makes fine adjustments mostly in brain some may be done by retinal nerves Correcting Vision Refraction densely packed cones sharpest image best color discrimination Image processing Physics 120 on retina convert light to electric impulse controlled by nervous system bend lens to control focus accomodation closest distance at which eye can focus clearly 25 cm Far point varies with person Physics 120 3 Physics 120 4 1 Correcting Farsighted Eye Correcting Nearsighted Eye lens images object further away virtual image is at person s near point lens images objects at infinity to a person s far point near point moves further out with these glasses Physics 120 not good for reading Physics 120 5 Microscope 6 Telescopes Images nearby objects Images distant objects Refracting telescopes use lenses Objective is usually several lenses to produce short Fo without severe aberrations M Nl fe fo in picture far point is 17 cm not very common anymore M fo fe N near point of eye Physics 120 7 Physics 120 8 2 Telescopes Telescopes Reflecting telescopes use mirrors Physics 120 Physics 120 9 Telescopes 10 Resolution is limited by Diffraction Diffraction Limit Physics 120 11 Physics 120 12 3 CT Scan CT Scan Regular X ray Computer Tomography image of slice CAT Computer Assisted Tomography Faster imaging with multiple beams detectors CT scan Physics 120 13 Physics 120 14 4



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