Introduction. Geometrical Optics. Milton Katz State University of New York. VfeWorld Scientific New Jersey London Sine Singapore Hong Kong


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1 Introduction to Geometrical Optics Milton Katz State University of New York VfeWorld Scientific «New Jersey London Sine Singapore Hong Kong
2 TABLE OF CONTENTS PREFACE ACKNOWLEDGMENTS xiii xiv CHAPTER 1: LIGHT 1.1 Introduction The Electromagnetic Spectrum Wave Motion Wavelength and Frequency Range Measurement of the Velocity of Light Light Sources SelfLuminous Incandescent Sources Electric Arcs and Discharges Fluorescent Lamps Lasers Light Reflecting Sources Optical Media Transparent, Colored and Translucent Materials Reflecting and Opaque Materials Point and Extended Sources Rectilinear Propagation of Light Pinhole Camera Propagation of Light in Nonhomogeneous Media The Corpuscular and Wave Theory of Light Umbra, Penumbra and Eclipses Real and Virtual Objects and Images Stops Field Stop Aperture Stop Baffles Optical System Vergence and Diopters Pencils and Beams of Light Point Source Extended Source Visual Angle 12 CHAPTER 2: REFLECTION AT PLANE MIRRORS 2.1 Reflection The Law of Reflection Mirror Rotation The Galvanometer Measurement of Mirror Rotation Angles 16
3 vi Contents Hadley's Sextant Image of a Point Formed by a Plane Mirror Image of an Extended Object Inversion and Reversion of Reflected Images Constant Deviation by Two Inclined Mirrors Applications of Constant Angles of Deviation Multiple Images Produced by Two Inclined Mirrors Construction of Images Image Series J Image Series К Number of J and К Images The Kaleidoscope Ray Paths to the Eye Field of View of a Plane Mirror Reflection According to Newton's Corpuscular Theory Reflection According to Huygens' Wave Theory 29 CHAPTER 3: REFRACTION OF LIGHT 3.1 The Law of Refraction The Reversibility of Light Refraction and Particle Motion Vector Diagram  Perpendicular Component Increased by Refraction Vector Diagram  Tangential Component Decreased by Refraction Huygens'Construction for Refraction Absolute Index of Refraction and Snell's Law Construction of Refracted Ray Deviation of the Refracted Ray Dispersion Total Internal Reflection Optical Path Length Fermat's Principle 40 CHAPTER 4: REFRACTION BY PLANES, PLATES AND PRISMS 4.1 Exact Ray Tracing Through a Plane Refracting Surface Exact Ray Tracing Through a Parallel Plate Displacement of Rays Obliquely Incident on a Tilted Plate Refraction Through Prisms Prism Geometry Limits to Prism Transmission: Grazing Incidence and Emergence Minimum Deviation by a Prism Calculation of the Path of a Ray Through a Prism Calculation of the Total Deviation by a Prism 50 CHAPTER 5: PARAXIAL REFRACTION AT PLANES, PLATES AND PRISMS 5.1 Paraxial Refraction at a Plane Surface Paraxial Image Formation by Parallel Plates Reduced Thickness 56
4 Contents vii 5.4 Thin Prisms Ophthalmie Prisms, Centrads and the PrismDiopter Obliquely Combined Prisms Risley Prisms 61 CHAPTER 6: REFRACTION AND REFLECTION AT SPHERICAL SURFACES 6.1 Sign Convention Refraction at a Single Spherical Refracting Surface The Paraxial Image Equation Focal Points and Focal Lengths Refracting Power Construction of OnAxis Image Points Construction of the Focal Points Construction of OffAxis Image Points Image Positions as an Object Approaches the Surface Possible Positions of the Image Lateral Magnification The Image Equation for Plane Surfaces Newtonian Equations The Focal Planes and Focal Images of a Spherical Refracting Surface The SmithHelmholtz Formula or Lagrange Invariant Reflection by Spherical Mirrors The Paraxial Image Equation The Focal Points of a Spherical Mirror Construction of Axial Image Points for Spherical Mirrors Construction of Focal Points of a Spherical Mirror Construction of OffAxis Image Points Formed by a Mirror Image Positions as an Object Approaches a Spherical Mirror Possible Positions of the Image Formed by a Spherical Mirror Lateral Magnification by Spherical Mirrors Newtonian Equations for a Spherical Mirror The Field of View of a Spherical Mirror Angular Magnification Vergence, Power and Curvature Vergence and Power Curvature and Vergence Curvature and Sagitta The Correction of Lens Measure Readings 87 CHAPTER 7: THIN LENSES 7.1 Convex and Concave Lenses Lens Nomenclature The Optical Center of a Lens The Thin Lens The Thin Lens Equation Focal Lengths Construction of the OffAxis Image Point 97
5 viii Contents 7.8 Lateral Magnification Vergence Equations and Power of a Thin Lens Thin Lens Power in NonUniform Medium Object and Image Formation by a Thin Lens Positive Lenses Negative Lenses Applications of Lenses with Various Conjugates The Minimum Separation Between a Real Object and Its Real Image Newtonian Equations The Focal Planes and Focal Images of a Thin Lens Prismatic Power of a Thin Lens Stops and Pupils of Lens Systems Procedure for Finding the Stops, Pupils and Field of View of a Thin Lens 106 CHAPTER 8: ROTATIONALLY SYMMETRICAL SYSTEMS 8.1 Introduction Paraxial Construction of the Image Paraxial Calculation of Images Through an Optical System The Vergence Form of the Refraction and Transfer Equations Iterative Use of the Vergence Equations 115 CHAPTER 9: ASTIGMATIC LENSES 9.1 Astigmatic Images Curvature and Power in Principal and Normal Sections Power in Oblique Meridians of a Cylinder The Oblique Power Equation Thin Astigmatic Lenses Forms of Astigmatic Lenses Transposition of Flat Prescriptions The Circle of Least Confusion and the Spherical Equivalent Lens The Circle of Least Confusion for Any Object Distance The Lengths of the Focal Lines and the Diameter of the CLC Obliquely Combined Cylinders 130 CHAPTER 10: THICK LENS SYSTEMS: PART I 10.1 Introduction The Cardinal Points The Principal Planes and Points The Nodal Points Construction of the Nodal Points Other "Cardinal" Points The Newtonian Equations for a Thick System The Refraction Equations for a Thick System The Lateral Magnification of a Thick Lens Summary of Vergence Equations for a Thick Lens System Lateral, Axial and Angular Magnification Lateral Magnification: Y 145
6 Contents ix Axial Magnification: X Angular Magnification: Ma 146 CHAPTER 11: THICK LENS SYSTEMS: PART II 11.1 The Gullstrand Equations Equivalent Power The Position of the Second Focal Point F' The Position of the Second Principal Point H' The Positions of the First Focal and Principal Points F and H Distances Referred to Principal Planes Summary of the Gullstrand Equations IThe Positions of the Nodal Points N and N' The Effect of Lens Thickness on the Positions of the Principal Planes The Effect of Lens Shape on the Position of the Principal Planes Telephoto and WideAngle Lenses Vertex Power Vertex Power and Ophthalmic Lenses Effective Power The Relationship of Effective Power to Vertex Power Combination of Two Thick Lens The Gullstrand Schematic Eye Procedure for Calculating Cardinal Points of the Schematic Eye Purkinje Images Calculation of Purkinje Image I Calculation of Purkinje Image II Calculation of Purkinje Image III 166 CHAPTER 12: STOPS, PUPILS AND PORTS 12.1 Types of Stops Pupils The Field Stop and the Entrance and Exit Ports Field of View and Vignetting Procedure for Finding the Stops, Pupils, Ports and Field of View 176 CHAPTER 13: NUMERICAL APERTURE, fnumber, AND RESOLUTION 13.1 Numerical Aperture fnumber Angular Resolution Linear Resolution Resolution Charts Snellen Charts Modulation Transfer Function The Numerical Aperture of a Fiber Optic 191 CHAPTER 14: MAGNIFIERS AND MICROSCOPES 14.1 Introduction Visual Angle and Angular Magnification 195
7 x Contents 14.3 The Magnifier or Simple Microscope Nominal Magnification Maximum Magnification A General Equation for Magnification The Accommodation Required to View the Image The Field of View of Magnifiers Types of Magnifiers The Compound Microscope Magnification by a Microscope Maximum Magnification by a Microscope The Compound Microscope as a Simple Magnifier The Stops of a Microscope Numerical Aperture and Resolution of Microscopes Maximum Usable Magnification of a Microscope Resolution, Wavelength and the Electron Microscope Depth of Focus of Microscope 205 CHAPTER 15: TELESCOPES 15.1 Introduction Refracting Telescopes The Astronomical or Keplerian Telescope Angular Magnification The Field of View of the Astronomical Telescope Field Lenses The Terrestrial Telescope Relay Lenses The Galilean Telescope Field and Opera Glasses The Prism Binocular Stereoscopic Range Through Binoculars Reflecting Telescopes Newtonian Telescope Gregorian Telescope Cassagrainian Telescope Catadioptric Telescopes The Maximum Useful Magnification of a Telescope 219 CHAPTER 16: CAMERAS AND PROJECTORS 16.1 Pinhole Camera and Camera Obscura Types of Cameras Camera Lenses Field of View of Cameras Depth of Field and Focus Hyperfocal Distance The Paraxial Design of a Zoom Lens Paraxial Design of a Telephoto Lens Optical Projection Systems 231
8 Contents xi CHAPTER 17: OPHTHALMIC INSTRUMENTS 17.1 Introduction Ophthalmometer Optical Principle Fixed MireVariable Image Size Ophthalmometers Variable MireFixed Image Ophthalmometers Radius of Curvature Refractive Power of the Cornea Doubling Principle Fixed Mire Size Ophthalmometer Adjustable Mire Size Ophthalmometer Badal Optometer Badal Target Position and Ametropia Alternate Arrangement of Badal Optometer Telecentric Systems The Lensometer Lensometer Target and Reticle Slit Lamp or Biomicroscope 247 CHAPTER 18: DISPERSION AND CHROMATIC ABERRATION 18.1 Introduction Wavelength and Index of Refraction Index of Refraction Dispersion Optical Glass Crown and Flint Glasses Chromatic Aberration of Thin Prisms Achromatic Prisms The Longitudinal Chromatic Aberration of Lenses Longitudinal Chromatic Aberration in Diopters Linear Longitudinal Chromatic Aberration Achromatic Lenses in Contact Transverse Chromatic Aberration Linear Transverse Chromatic Aberration Transverse Chromatic Aberration in Prism Diopters Achromatic Combination of Two AirSpaced Lenses The Huygens Eyepiece The Ramsden Eyepiece The Kellner and Other Eyepieces 267 CHAPTER 19: TRIGONOMETRIC RAY TRACING 19.1 Introduction Ray Tracing Sign Conventions and Nomenclature Ray Tracing Equations Transfer Equations Ray Tracing Through a Series of Surfaces 276
9 xii Contents 19.5 Longitudinal and Transverse Spherical Aberration Ray Trace Calculations for a Pencil of Rays A Format for Tracing Rays Through a Lens Image Evaluation Spherical Aberration Curves Ray Intercept Curves Spot Diagrams Radial Energy Diagrams Knife Edge Distributions Graphical Ray Trace 282 CHAPTER 20: MONOCHROMATIC ABERRATIONS 20.1 Introduction Third Order Theory Third Order Aberration Polynomial The Spherical Aberration Terms of the Polynomial Spherical Aberration of a Thin Lens Spherical Aberration and Lens Bending Correction of Spherical Aberration The Coma Terms of the Aberration Polynomial Coma of a Thin Lens The Sine Condition Astigmatism Astigmatism by a Spherical Refracting Surface Astigmatism by a Thin Lens Petzval Curvature Petzval Curvature of a Refracting Surface Petzval Curvature of a Series of Surfaces Petzval Curvature of a Thin Lens in Air The Petzval Condition for Flattening the Field Astigmatism and Petzval Curvature Polynomial Terms Distortion The Third Order Distortion Polynomial Term The Tangent Condition 301 BIBLIOGRAPHY 305 INDEX 309
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