A convex lens is thicker at the centre than at the edges.
Use of Convex Lenses – The CameraA camera consists of three main parts.
The Magnifying GlassA magnifying glass is a convex lens which produces a magnified (larger) image of an object. A magnifying glass produces an upright, magnified virtual image. The virtual image produced is on the same side of the lens as the object. For a magnified image to be observed the distance between the object and the lens must be shorter than the focal length of the lens.
MagnificationThe magnification of a lens can be calculated using the following formula; As this is a ratio between heights it has no units. A magnification of 2 means the image is twice the size of the object and a magnification of 1 indicates an image size being the same as the object size. Concave LensA concave lens is thinner at the centre than at the edges.
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With magnification alone? Impossible. You need to know at least something more. Here's, for example, if you also know focal length. First, one of the standard formulas for magnification is: $m=-\frac{s_i}{s_o}$. Using that and the usual $\frac{1}{f}=\frac{1}{s_i}+\frac{1}{s_o}$: $$ \frac{1}{f}=\frac{1}{s_o}-\frac{1}{m s_o} $$ $$ s_o = f \left( 1 - \frac{1}{m} \right) $$ For an upright image, $m$ is positive. For convex lens, $f$ is positive. For an object in front of the lens, $s_o$ is positive and for the image behind the lens, $s_i$ is positive. For a real image, image and object are on the opposite sides so $s_o$ and $s_i$ are either both positive or both negative. For a virtual image, they are on the same side so they have opposite signs. |