The New Encyclopaedia Britannica, Volume 24Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries |
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Page 307
... lens on film or a projection lens on a motion - picture screen . Virtual images are made by rays that do not actually come from where the image seems to be ; e.g. , the virtual image in a plane mirror seems to be at some distance behind ...
... lens on film or a projection lens on a motion - picture screen . Virtual images are made by rays that do not actually come from where the image seems to be ; e.g. , the virtual image in a plane mirror seems to be at some distance behind ...
Page 345
... lens from epidermis under influence of the eye cup , which grows toward the skin from the brain . As the eye cup contacts any neighbouring epidermis , it transforms that particular region into a lens . The exact nature of the stimulus for ...
... lens from epidermis under influence of the eye cup , which grows toward the skin from the brain . As the eye cup contacts any neighbouring epidermis , it transforms that particular region into a lens . The exact nature of the stimulus for ...
Page 379
... lens focus ; ( D ) reflector ; ( E ) eye point : ( L ) quality lens : ( C1 ) reference plane ; ( C2 ) workpiece light and dark bands called interference fringes . Information derived from fringe mea- surements is used for precise ...
... lens focus ; ( D ) reflector ; ( E ) eye point : ( L ) quality lens : ( C1 ) reference plane ; ( C2 ) workpiece light and dark bands called interference fringes . Information derived from fringe mea- surements is used for precise ...
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