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Draw ray diagrams to show the formation of three times magnified (a) real, and (b) virtual image of an object by a converging lens. Mark the positions of O, F and 2F in each diagram. - Science

Draw ray diagrams to show the formation of three times magnified (a) real, and (b) virtual image of an object by a converging lens. Mark the positions of O, F and 2F in each diagram.

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Solution

For real image: To get three times magnified image, the object is placed between the F1 and 2F1
The position of the object is set such that image distance is equal to the thrice of the object distance (v=3u). 

For virtual image: To get three times magnified image, the object is placed between the focus F1 and optical centre O. 
The position of the object is set such that image distance is equal to the thrice of the object distance (i.e. v=3u).

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