By B. K. Johnson

ISBN-10: 0486606422

ISBN-13: 9780486606422

This helpful sensible consultant indicates easy methods to arrange operating versions of telescopes, microscopes, photographic lenses and projecting structures, then indicates the best way to behavior experiments for picking out accuracy, resolving energy, settling on aberration, and extra. simply effortless arithmetic required. Index. 234 diagrams.

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Extra info for Optics and Optical Instruments: An Introduction (Dover books explaining science)

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Plano-convex lenses. the field-lens having app roximately twice the focal length of the eye-lens. with a separation equal to one-and-a-half times the focus of the latter. A model of this can be made up by employing two spectacle lenses of + 60 . and + 120. arranged in holders on the optical bench and separated in distance by 12'5 em. (See Fig. ) At the focus of the + 120. (namely. 8·3 em. from it) place the diaphragm of fiveeighths inch diameter aperture. • the + 20 . lens previously used) should then be placed on the optical bench and adj usted so that its focal plane lies in the plane of the diaphragm.

Hav ing directed the telescope towards the vertical scale of the openfield test objects (Fig. 64), the image seen through the instrument is arranged to be superimposed on the scale divisions seen directly with the other eye. By counting the number of the latter covered by (say) one division of the magnified image of the scale, will give the magnifying power of the telescop'1 This simple method sometin'les presents difficulty to the observer due to inability of superimposing the two images, although this is generally I possible after a little practice.

Huygcnian Eyepiece, This form of eyepiece is employed in many sighting instrume nts which are used for observational work. chiefly on account of the absence of colour fringes to the image in the outer parts of the field. In other words this eyepiece suffers less from chromatic difference of magnification than other forms. Th e eyepiece consists of two Qiophro'j""l "~D . r. oos 1"1Z-D. et glo... Field 10... f-IZ~- E~- ...... FIG. 6 1. Huygenian Eyepiece Model. plano-convex lenses. the field-lens having app roximately twice the focal length of the eye-lens.

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Optics and Optical Instruments: An Introduction (Dover books explaining science) by B. K. Johnson


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