An Elementary Treatise on Geometrical Optics ... |
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Page 26
... move to where F is at any time , F will move to where Q was previously . The points Q and F are sometimes called conjugate foci . When the original pencil consists of parallel rays Q is at an indefinitely great distance and 0. Hence AF ...
... move to where F is at any time , F will move to where Q was previously . The points Q and F are sometimes called conjugate foci . When the original pencil consists of parallel rays Q is at an indefinitely great distance and 0. Hence AF ...
Page 27
... moves up towards O , F also moves towards O , and at O they coincide ; for when u = r , v = r . R A Q When moves from 0 to F1 , F moves from 0 to a great r 2 2 distance to the right , and when Q is at F , u = and the reflected rays are ...
... moves up towards O , F also moves towards O , and at O they coincide ; for when u = r , v = r . R A Q When moves from 0 to F1 , F moves from 0 to a great r 2 2 distance to the right , and when Q is at F , u = and the reflected rays are ...
Page 28
... moves farther to the left , F approaches nearer to F ,, till when Q has got to a point at an infinite distance to the left of A , u∞ , and F coincides again with F1 . 35. From the formula μ 1 - μ 1 = -- ข น we see that in the case of ...
... moves farther to the left , F approaches nearer to F ,, till when Q has got to a point at an infinite distance to the left of A , u∞ , and F coincides again with F1 . 35. From the formula μ 1 - μ 1 = -- ข น we see that in the case of ...
Page 29
... moves from an infinite distance up to 0 ) , F moves from F , to 0 , and at O they coincide . ( 3 ) As Q moves from 0 to A , F also moves from 0 to A , being nearer to O than Q is , and at A , Q and F again coincide . r ( 4 ) As Q moves ...
... moves from an infinite distance up to 0 ) , F moves from F , to 0 , and at O they coincide . ( 3 ) As Q moves from 0 to A , F also moves from 0 to A , being nearer to O than Q is , and at A , Q and F again coincide . r ( 4 ) As Q moves ...
Page 32
... this will also be the case if the plane mirror move so as always to touch a prolate spheroid of which the luminous point is one focus . 12. A luminous point is placed in front of a 32 REFLECTION AND REFRACTION OF DIRECT PENCILS .
... this will also be the case if the plane mirror move so as always to touch a prolate spheroid of which the luminous point is one focus . 12. A luminous point is placed in front of a 32 REFLECTION AND REFRACTION OF DIRECT PENCILS .
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Common terms and phrases
2nd edition 3rd edition 4th edition Aeneid angle of incidence astronomical telescope axis Book Camb Cambridge centre concave convex lens cos² Crown 8vo Demy 8vo diameter direction distance diverge emergence English equal eye-glass eye-lens eye-piece F. A. PALEY Fcap Fellow of St focal length foci formula French geometrical focus glass Grammar Greek Hence illumination image formed inches incident ray index of refraction J. H. FREESE John's College last Article late Fellow Latin lenses LL.D luminous point magnifying power Mathematical minimum deviation object object-glass obliquely parallel rays pass pencil pencil of light pencil of parallel perpendicular placed portion primary plane prism Professor radius ray of light reflected ray reflecting surface refracted ray refraction or reflection refractive index revised School screen Small post 8vo spectrum sphere spherical surface Translated triangle Trinity College v₁ vertex whence
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