Difference between revisions of Vertex distance
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→Calculation: add some words to describe what's going on in terms of virtual images.
("corrected" is not the same as "perceived". Also add a few more words.) |
(→Calculation: add some words to describe what's going on in terms of virtual images.) |
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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 | 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. | ||
* a minus lens creates the virtual image of a distant object near its focal point. When the lens is moved away from the eye, so too is the virtual image. This is equivalent to using a weaker minus lens. | |||
* a plus lens creates the virtual image of a near object on the other side of its focal point. When the lens is moved towards the object, the virtual image is pushed further away from lens, and therefore also the eye. This is equivalent to using a stronger plus lens. | |||
==References== | ==References== | ||