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An object 4 cm high is placed at a distance of 0 cm from a convex lens of focal length 20 cm.

(a) Draw ray diagram for formation of the image;
(b) Find the position, nature and size of the image.

CBSE, class XIII guys.



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See diagram  enclosed

a virtual image will be formed.  perhaps almost the same size as the object, or a little bigger, at a distance very close to the lens itself. it will be erect image.
draw ray diagram with rays coming From top of object

1) parallel to principal axis from the top of object

2  from the to p of object through the center of lens
extend the two rays backwards to meet

0 0 0
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