Real images are thosewhere light actually converges, conversely, virtual pictures arelocations from whereby light shows up to have converged. Actual imagesoccur once objects room placed exterior the focallength the a converging lens or external the focal length of a converging mirror. A real photo is shown below. Raytracing gives the position of the images by drawing oneray perpendicular come the lens, which should invernessgangshow.netss through the focalpoint, and also a 2nd ray that invernessgangshow.netsses through the facility of thelens, which is not bent by the lens. The intersection the thetwo rays provides the position of the image. (A 3rd ray can be drawn which invernessgangshow.netsses v the focal suggest on the left next of the lens; after ~ invernessgangshow.netssing through the lens, the would take trip invernessgangshow.netrallel come the axis, and would intersect the other two rays at the point where those rays currently intersect. Keep in mind that the realimage is inverted. (The image happens come be bigger than the object. That happens since the object is between f and 2f away from the lens; if the lens to be farther away than 2f, the image would be closer to the lens than 2f, and would be smaller than the object.)


The position of theimage can be found through the equation:


Here, the distancesare those that the object and image respectively as measured fromthe lens. The focal length length f ispositive for a convex lens. A positive photo distance correspondsto a genuine image, just as that did because that the situation of the mirrors.However, for a lens, a positive photo distance implies that theimage is situated on the opposite side from the object.(You will have no trouble remembering this if you think about it in the appropriate way: a genuine image needs to be whereby the irradiate is, which method in front the a mirror, or behind a lens.)

Virtual photos areformed through diverging lenses or through placing an object inside the focallength the a converging lens. The ray-tracing practice is repeated forthe case of a online image.


In this case thevirtual picture is upright and also shrunken. The same formula because that theimage and object ranges used above applies again here. Only inthis situation the focal length is negative, and also the equipment for theimage distance will likewise be negative.

You are watching: A lens produces a real image of a real object.

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Virtual photos can likewise beproduced by converging lenses as soon as the thing is put inside thefocal length. In the case, the virtual photo will be upright andenlarged, as it will certainly be more from the lens 보다 the object.