Essentials of physicsW.B. Saunders, 1896 - 319 pages |
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Page 161
... lens there is a point on the principal axis called the optical centre . Every ray of light passing through it experiences no angular deviation . In double convex and double concave lenses this point is halfway between their respective ...
... lens there is a point on the principal axis called the optical centre . Every ray of light passing through it experiences no angular deviation . In double convex and double concave lenses this point is halfway between their respective ...
Page 162
... lenses the principal focus coincides very nearly with the centre of curvature ; in plano - convex lenses the principal focal distance is twice that of a double convex lens . Again , let luminous rays diverge from L ( Fig . 77 ) . The ...
... lenses the principal focus coincides very nearly with the centre of curvature ; in plano - convex lenses the principal focal distance is twice that of a double convex lens . Again , let luminous rays diverge from L ( Fig . 77 ) . The ...
Page 166
... lens the rays pass through and are bent ; hence the prin- cipal focus and real images are all on the far side of the lens . The principal focus of a concave or a convex mirror is about half- way between the centre of curvature and the ...
... lens the rays pass through and are bent ; hence the prin- cipal focus and real images are all on the far side of the lens . The principal focus of a concave or a convex mirror is about half- way between the centre of curvature and the ...
Contents
BOOK I | 17 |
The Attractions of Matter | 26 |
Matter Force and Motion | 33 |
37 other sections not shown
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acid ampères angle aperture armature attraction axis barometer battery body called camera carbon cell chemical ciliary muscle circuit coil collodion colors concave condensing conductor connected containing convex convex lens cornea crystalline lens Describe direction disk dynamo electricity electro-magnet electrolysis eye-piece film focus force galvanometer gases gelatin glass gun-cotton H₂SO heat heliostat hydrometer induced currents induction instrument intensity iron Jefferson Medical College Leclanché cell lens lenses Leyden jar light liquid luminous machine magnet magnified Medical metal microscope mirror molecules motion needle negative object optic paper paper negatives parallel passes Philadelphia picture placed platinum polarized pole presbyopia pressure principle prints prism produced quantity rays reflected refraction resistance retina silver solid sound spectrum Spherical aberration substances surface Surgery telescope temperature Text-Book thermometer tion transmitted tube vapor velocity vessel vibrations vitreous humor voltaic volume weight wire