Optics Without MathematicsSociety for promoting Christian knowledge, 1883 - 124 páginas |
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Página 25
... Axis , any other line through CR falling elsewhere being an Oblique ( or Secondary ) Axis . Now let us move R gradually along the axis towards the mirror . In proportion as we do so , the incident rays will make larger angles with CP ...
... Axis , any other line through CR falling elsewhere being an Oblique ( or Secondary ) Axis . Now let us move R gradually along the axis towards the mirror . In proportion as we do so , the incident rays will make larger angles with CP ...
Página 26
... axis at v . Such an imaginary meeting - point is called a Virtual Focus , which will approach the mirror behind in proportion as R does in front . Now since the course of light is reversible , let us make R and F change places . R will ...
... axis at v . Such an imaginary meeting - point is called a Virtual Focus , which will approach the mirror behind in proportion as R does in front . Now since the course of light is reversible , let us make R and F change places . R will ...
Página 27
... our way , and we can show the principle on paper . We have set our lighted taper in front of the mirror . The wick is in the principal axis , and somewhere in that axis its conjugate focus will fall , OPTICS WITHOUT MATHEMATICS . 27.
... our way , and we can show the principle on paper . We have set our lighted taper in front of the mirror . The wick is in the principal axis , and somewhere in that axis its conjugate focus will fall , OPTICS WITHOUT MATHEMATICS . 27.
Página 28
... axis , and the ray being reflected straight back , will have a con- jugate focus somewhere in that axis . But where ? That we can easily show . Take a point any- where else in the mirror , draw CP to it , make a the angles APC CPa equal ...
... axis , and the ray being reflected straight back , will have a con- jugate focus somewhere in that axis . But where ? That we can easily show . Take a point any- where else in the mirror , draw CP to it , make a the angles APC CPa equal ...
Página 29
... axes at C. And it is no virtual meeting of direction only ; it is a real crossing of a multitude of rays , though being in the air it requires something to make it visible . This can be done in several ways ; by making a smoke to rise ...
... axes at C. And it is no virtual meeting of direction only ; it is a real crossing of a multitude of rays , though being in the air it requires something to make it visible . This can be done in several ways ; by making a smoke to rise ...
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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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