Optics Without MathematicsSociety for promoting Christian knowledge, 1883 - 124 páginas |
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Página 25
... proportion as we do so , the incident rays will make larger angles with CP ( P being supposed anywhere ) and the reflected P PF 7 R ones will go further out , and owing to the slanting position as regards the axis , F will move much ...
... proportion as we do so , the incident rays will make larger angles with CP ( P being supposed anywhere ) and the reflected P PF 7 R ones will go further out , and owing to the slanting position as regards the axis , F will move much ...
Página 26
... proportion as R does in front . Now since the course of light is reversible , let us make R and F change places . R will be behind the mirror , and vir- tual , when F is very near its front . This does not happen in nature , where rays ...
... proportion as R does in front . Now since the course of light is reversible , let us make R and F change places . R will be behind the mirror , and vir- tual , when F is very near its front . This does not happen in nature , where rays ...
Página 30
... proportion to their distance ; so that az will be larger than AZ in pro- portion as it is further from P. And the reverse if object and image change places . Also they will not be equal in brightness ; the furthest from P will be the ...
... proportion to their distance ; so that az will be larger than AZ in pro- portion as it is further from P. And the reverse if object and image change places . Also they will not be equal in brightness ; the furthest from P will be the ...
Página 32
... proportion of 12 to 722 , more than 5000 times , and as in putting the solar heat as low as 100 ° Fahrenheit , we should much more than allow for loss of light in reflection , we could reckon upon the almost inconceivable temperature of ...
... proportion of 12 to 722 , more than 5000 times , and as in putting the solar heat as low as 100 ° Fahrenheit , we should much more than allow for loss of light in reflection , we could reckon upon the almost inconceivable temperature of ...
Página 36
... proportion of the angle of the refracted to that of the incident ray , is a curious one ; but it will take you rather further into mathematics than you may like . If so , you may skip it . But I advise you not . 1 There is an exception ...
... proportion of the angle of the refracted to that of the incident ray , is a curious one ; but it will take you rather further into mathematics than you may like . If so , you may skip it . But I advise you not . 1 There is an exception ...
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Términos y frases comunes
angles of incidence aperture axis beautiful called candle circle cloth boards colour concave lens concave mirror conjugate foci converging convex lens course crossing crystal crystalline lens curious curves dark direction dispersion distance Double Refraction edge equal angles equi-convex eye-lens Fcap feet focal image focal length form an image fraction front happens hole inches larger lenses look looking-glass magnifying power microscope minute moon Newtonian reflector NORTHUMBERLAND AVENUE object object-glass opposite optical parallel rays perfect perfectly picture plane mirror polarised position prism produce PROMOTING CHRISTIAN KNOWLEDGE properties of light proportion radiant radius rainbow ray passes reflected rays reflecting telescopes refraction retina reverse right angles seen shorter focus side sideways sine Sir EDMUND BECKETT spectrum speculum sphere spherical spherical aberration straight line suppose surface telescope thing tion turned undulations violet waves wonderful
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