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The Stage 36 Centration of a Rotating Stage 40
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Abbe condenser achromatic achromatic objectives angle aplanatic apochromatic appear arrangement back lens binocular binocular microscope camera extension camera lens centring screws coarse adjustment compensating eyepieces condenser lens correction collar cover glass critical illumination dark ground illumination dark slide diatom diffracted distance effect exposure eyepiece field of view filament film filter fluorite focal length focal plane focused ground glass high power illuminating cone immersion objective infra-red instrument iris diaphragm lamp condenser lamp iris lenses light source low power objective magnification makers mechanical stage method micrometer milled heads millimetre mount negative numerical aperture observation oil immersion oil immersion objective optical axis panchromatic phase contrast Photo photographic photomicrography placed power dark ground primary image prism produced rays refractive index resolving power result seen shown in Fig specimen spectrum spherical aberration stop substage condenser substage iris suitable surface thickness total internal reflection tube length ultra-violet usually visual wavelength whilst