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CBSE Class 10 Answered

a distance at which an object should be placed from a convex lense of focal lenght 10cm to obtain a virtuaL image of double of its size is?
Asked by | 22 Feb, 2012, 03:57: PM
answered-by-expert Expert Answer

At the 2F point, the object distance equals the image distance and the object height equals the image height. As the object distance approaches one focal length, the image distance and image height approaches infinity. Finally, when the object distance is equal to exactly one focal length, there is no image. Then altering the object distance to values less than one focal length produces images that are upright, virtual and located on the same side of the lens as the object. Finally, if the object distance approaches 0, the image distance approaches 0 and the image height ultimately becomes equal to the object height. These patterns are depicted in the diagram below. Eight different object locations are drawn in red and labeled with a number; the corresponding image locations are drawn in blue and labeled with the identical number.

Answered by | 22 Feb, 2012, 07:08: PM
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