A concave lens has a focal length of 10cm. An object is placed 15cm in front of the lens on the principal axis.
(i) Find the position of the image formed.
(ii) Calculate the magnification and comment on the nature and size of the image.
(iii) The object is now shifted to 8cm from the lens. Repeat parts (i) and (ii) for the new position and compare the two sets of results.