Real images are thosewhere light actually converges, conversely, virtual photos arelocations from whereby light appears to have actually converged. Genuine imagesoccur once objects sjuniorg8.comce placed outside the focallength that a converging lens or exterior the focal size of a converging mirror. A real image is portrayed below. Raytracing gives the position of the photos by illustration oneray perpendicular to the lens, which have to juniorg8.comss v the focalpoint, and also a second ray that juniorg8.comsses with the facility of thelens, which is no bent by the lens. The intersection of thetwo rays provides the position of the image. (A third ray could be attracted which juniorg8.comsses with the focal allude on the left next of the lens; after ~ juniorg8.comssing v the lens, that would travel juniorg8.comrallel come the axis, and would crossing the various other two rays in ~ the suggest where those rays currently intersect. Note that the realimage is inverted. (The image happens come be bigger than the object. That happens due to the fact that the object is in between f and also 2f away from the lens; if the lens to be farther away than 2f, the photo would it is in closer come the lens than 2f, and also would be smaller sized than the object.)


The position of theimage deserve to be discovered through the equation:


Here, the distancesare those that the object and also image respectively together measured native lens. The focal length length f ispositive because that a convex lens. A positive picture distance correspondsto a genuine image, simply as that did because that the situation of the mirrors.However, because that a lens, a positive photo distance indicates that theimage is located on the opposite side from the object.(You will have actually no trouble remembering this if friend think around it in the ideal way: a real image needs to be where the light is, which way in front the a mirror, or behind a lens.)

Virtual pictures areformed by diverging lenses or through placing an item inside the focallength the a converging lens. The ray-tracing exercise is repeated forthe case of a virtual image.


In this case thevirtual image is upright and also shrunken. The exact same formula because that theimage and object distances used over applies again here. Just inthis case the focal size is negative, and the systems for theimage street will likewise be negative.

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Virtual photos can likewise beproduced by converging lenses when the object is inserted inside thefocal length. In that case, the virtual image will it is in upright andenlarged, as it will be more from the lens than the object.