equivalent, so far as magnification is concerned, to a singlelens whose focal length is % that of either component. Thefront Lens, called the field-lens, is placed very close to the realimage ab. and therefore forms from it a virtual image ab,slightly Larger, and slightly farther away. In fact, ab,… … OPERA GLASS 101 or at whatever distance from the eye is most suitable for theobserver, adjustment being secured by sliding the whole eye-piece toward or away from the real image ab. Since ab liesclose to the field lens, the latter receives and transmits lightfrom an area of the image practically…
Light
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