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PHY2061 R. D. Field Department of Physics chp40_5.doc University of Florida Thin Lenses Formula Lens Makers Equation: The lens maker&s formula is 1 1 11 12 f n RR =− − () , where f is the focal length , n is the index of refraction , R 1 is the radius of curvature of side 1 ( side that light enters the lens ), and R 2 is the radius of curvature of side 2 ( side that light exits the lens ). Lens Equation: 1 pi f += Magnification: m i p Sign Conventions: Variable Assigned a Positive Value Assigned a Negative Value p (object distance) (almost) always positive i (image distance) if image is on R-side (
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