Which of the above two cases illustrates the working of a magnifying glass?

An object 3 cm high is placed 24 cm away from a convex lens of focal length 8 cm. Find by calculations, the position, height and nature of the image.

If the object is moved to a point only 3 cm away from the lens, what are the new position, height and nature of the image?

Find the nature, position and magnification of the images formed by a convex lens of focal length 0.20 m if the object is placed at a distance of :

(i) 0.50 m (ii) 0.25 m (iii) 0.15 m

Which of the above cases represents the use of convex lens in a film projector, in a camera, and as a magnifying glass?