Elementary Treatise on Natural Philosophy, Volumen4D. Appleton, 1891 |
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Página 995
... emergent beam is normal to the sur- faces of the liquid and glass ; the position of the arm accordingly indicates the direction of the refracted ray . The angles of inci- dence and refraction can be read off at the verniers carried by ...
... emergent beam is normal to the sur- faces of the liquid and glass ; the position of the arm accordingly indicates the direction of the refracted ray . The angles of inci- dence and refraction can be read off at the verniers carried by ...
Página 999
... emergent rays will see a virtual image in a direc- tion at right angles to that in which the object lies . In practice , the eye is held over the angle a of the prism , in such a position that one- half of the pupil receives these ...
... emergent rays will see a virtual image in a direc- tion at right angles to that in which the object lies . In practice , the eye is held over the angle a of the prism , in such a position that one- half of the pupil receives these ...
Página 1000
... emergent rays of a small and nearly normal pencil emitted by O will , if produced backwards , intersect OA at points indefinitely near to the point I thus determined . If the eye of an observer be situated on the production of the ...
... emergent rays of a small and nearly normal pencil emitted by O will , if produced backwards , intersect OA at points indefinitely near to the point I thus determined . If the eye of an observer be situated on the production of the ...
Página 1001
... equal to the original angle of incidence SIN . The emergent ray R S ' is therefore parallel to the incident ray SI , but is not in the same straight line with it . Objects seen obliquely through a plate are therefore displaced from.
... equal to the original angle of incidence SIN . The emergent ray R S ' is therefore parallel to the incident ray SI , but is not in the same straight line with it . Objects seen obliquely through a plate are therefore displaced from.
Página 1002
... emergent rays which enter the eye are parallel to the incident rays ; but as they have undergone lateral displacement , their point of concourse1 is changed from S to S ' , which is accordingly the image of S. The displacement thus ...
... emergent rays which enter the eye are parallel to the incident rays ; but as they have undergone lateral displacement , their point of concourse1 is changed from S to S ' , which is accordingly the image of S. The displacement thus ...
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Términos y frases comunes
achromatic analyser angle of incidence beam body bright lines called centimetres centre coincidence colours concave mirror conjugate foci convex convex lens crystal curvature denote diameter direction distance employed equal experiment eye-piece flame focal length frequency of vibration fundamental note glass harmonics Hence Iceland-spar incident ray index of refraction interval inverted law of sines lens lenses luminous point magnifying power medium metres minimum deviation nearly node normal number of vibrations object object-glass oblique observer obtained octave optical ordinary parallel particles pencil perpendicular pipe pitch placed plane mirror plate polarization portion position principal axis principal focus prism produced propagation radius rarefaction ratio reflected rays refrangibility represented retina rotation screen seen side slit solar spectra spectrum spherical string subtends surface telescope tion tone traversing tube undulation velocity of sound vertical vibrations vibrations per second violet virtual image visual angle wave-front wave-length waves