Answer :

(i) Ray diagram when object is placed in front of a convex lens at F



The image in this case is formed at infinity, it is real, inverted and highly enlarged.


(ii) Ray diagram when object is placed at 3F of a convex lens



Position of image in this case is between F and 2F on other side of lens, the image formed is real, inverted and diminished.


(iii) Ray diagram when object is placed between the lens and infinity of a concave lens



The position of Image in this case is between optical centre and the focus on the side of object. It is virtual, erect and diminished.


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