# lec20 - O I The Thin Lens Equation • Assuming the object...

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Lenses Lenses alter the direction of light rays due to refraction of at the lens surfaces. The surfaces are usually spherical. There are two types of lenses: Thin lenses have focal length much larger than their thickness. (i.e. the radius of curvature of lens surfaces are large compared with lens size). Thin lenses have sharp, well defined focal points. Images formed by converging lenses Images formed by diverging lenses Diverging lens . F F . f Converging lens . . F f F . . F F O I real image inverted F F . . O I virtual image up-right Diverging lenses form only virtual images F’ F .

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Unformatted text preview: . O I The Thin Lens Equation • Assuming the object is located to the left of the lens: Thin lens equation Magnification equation • Sign convention (for single lens system) f d i d o F’ F . . O I h o h i i o d 1 d 1 f 1 + = o i o i d d h h m − = = f : + for converging lenses; - for diverging lenses d o : + for object located to the left of the lens d i : + for real image formed to the right of the lens- for virtual image formed to the left of the lens h o , h i : + above principal axis; - below principal axis...
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lec20 - O I The Thin Lens Equation • Assuming the object...

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