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

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

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

A spherical mirror and a spherical lens each have a focal length of, -15 cm. The mirror and the lens are likely to be:

Linear magnification produced by a convex lens can be: