Difference between revisions of Vertex distance
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→Calculation: still hadn't convinced myself with the wording
(→Calculation: add some words to describe what's going on in terms of virtual images.) |
(→Calculation: still hadn't convinced myself with the wording) |
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where <math>f_C = \frac{1}{D_C}</math> and <math>f = \frac{1}{D}</math> | where <math>f_C = \frac{1}{D_C}</math> and <math>f = \frac{1}{D}</math> | ||
Conceptually, the location of the [[Optics_related_math#Virtual_image|Virtual image]] is changed because the lens has moved relative to the eye and source object. | Conceptually, the location of the [[Optics_related_math#Virtual_image|Virtual image]] is changed because the lens has moved relative to the eye and source object. For a distant source object, the image is formed at the focus point of the lens, and so simply moves with the lens. | ||
* a minus lens | * for a minus lens, moving the virtual image further from original location of the lens is equivalent to using a weaker minus lens | ||
* a plus lens | * for a plus lens, moving the (real) image towards the original location to the lens is equivalent to using a stronger plus lens. | ||
==References== | ==References== | ||