Psych312_Week2Lecture1_Light&TheEye.pdf

# Psych312_Week2Lecture1_Light&TheEye.pdf - LIGHT AND THE...

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LIGHT AND THE EYE

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Image Focusing: Object distance Object distance (s o ): Distance of a light-reflecting object from the lens Object distance (s o )
Image Focusing: Image distance Object distance (s o ) Image distance (s i ) Image distance (s i ): Distance of an object’s image from the lens Image distance (s i ) Object distance (s o ) =

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Image Focusing: Focal distance Focal distance (f): Image distance when the object distance is infinity Focal distance (f) Object distance (s o ) Image distance (s i ) Focal distance (f) = Image distance (s i ) Object distance (s o ) =
Image Focusing: Focal distance Focal distance (f) Focal distance (f) Focal distance (f): Image distance when the object distance is infinity Indicates the lens strength (amount of refraction)

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Image Focusing: The eye Cornea does 2/3 of refraction (light bending) Fixed refracting power Lens does 1/3 of refraction Variable refracting power Accommodation Image distance in the eye is fixed
Lens accommodation Ciliary muscle contracts zonule fibers become looser lens becomes thicker

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Unaccommodated lens: s i > eyeball length and image appears blurry Image Focusing: The eye Accommodated lens: s i = eyeball length and image appears crisp
Image focusing: Thin lens formula Distance form of the thin lens formula : 1/f = 1/s i + 1/s o Focal distance Image distance Focal distance Object distance (s o ) Image distance (s i ) Object distance

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Image focusing: Thin lens formula Distance form of the thin lens formula : 1/f = 1/s i + 1/s o Focal distance Image distance Object distance In the human eye, image distance is fixed s i = 0.0167 m
Image focusing: Thin lens formula Diopters describe lens strength Focal distance (f) Focal distance (f) Shorter focal distance = more diopters

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