Real images are thosewhere light actually converges, conversely, virtual images arelocations from whereby light shows up to have converged. Actual imagesoccur once objects space placed exterior the focallength the a converging lens or outside the focal size of a converging mirror. A real picture is illustrated below. Raytracing gives the position of the images by illustration oneray perpendicular come the lens, which should yellowcomic.comss v the focalpoint, and also a second ray the yellowcomic.comsses through the center of thelens, which is not bent by the lens. The intersection that thetwo rays offers the position of the image. (A 3rd ray could be drawn which yellowcomic.comsses v the focal suggest on the left next of the lens; after yellowcomic.comssing through the lens, it would take trip yellowcomic.comrallel to the axis, and would intersect the other two rays in ~ the point where those rays already intersect. Note that the realimage is inverted. (The photo happens come be larger than the object. The happens due to the fact that the object is in between f and also 2f far from the lens; if the lens were farther away 보다 2f, the photo would be closer come the lens 보다 2f, and also would be smaller than the object.)


The position of theimage can be discovered through the equation:


Here, the distancesare those that the object and image respectively as measured native lens. The focal length length f ispositive because that a convex lens. A positive photo distance correspondsto a actual image, just as the did because that the instance of the mirrors.However, because that a lens, a positive photo distance implies that theimage is located on the opposite next from the object.(You will have actually no trouble remembering this if you think about it in the ideal way: a actual image has to be where the light is, which means in front of a mirror, or behind a lens.)

Virtual images areformed by diverging lenses or by placing an object inside the focallength that a converging lens. The ray-tracing practice is repeated forthe instance of a online image.


In this instance thevirtual photo is upright and shrunken. The same formula for theimage and also object ranges used above applies again here. Only inthis instance the focal size is negative, and also the solution for theimage street will likewise be negative.

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Virtual pictures can additionally beproduced through converging lenses when the object is inserted inside thefocal length. In the case, the virtual picture will be upright andenlarged, together it will be further from the lens than the object.