Draw the ray diagram in each case to show the position and nature of the image formed when the object is placed:
(i) In front of a convex lens at F,
(ii) At 3F of a convex lens,
(iii) Between the lens and infinity of a concave lens.
(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.