1.

It is required to throw an image, magnifiedtwo times, on a screen placed at a distance of6 cm from the object. Find the focal lengthand nature of the lens required.

Answer»

m=2m=v/u=2v=2ualsov=u+62u=u+6u=6v=2uv=12the object distance is always negativesou=-6also the image is on the same side of the object .sov=-12using lens formula1/f=1/v-1/u1/f=1/-12-1/-61/f=1/12f=12

Focal length is positive.So,it is a convex lens.



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