Answer :

Given,

Focal length of convex lens = 18 cm


Object distance u = -27 cm


Image distance =??


We know that lens formula is:



Substituting the values given:








v = 54 cm


Since v is positive it means image is formed behind the lens. So, the image is real.





magnification = -2



Height of image = -2 ×height of object


Thus image formed is twice the size of object but –ve sign indicates that it is inverted.


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