Question

5. Where on the axis of a converging lens, such as a biconvex lens, would you place an object in order to produce an image the same size as the original:

   1. put the object at twice the focal length from the lens.

   2. half way between the focal length and the center of curvature of the lens.

   3. between focal length and the lens.

   4. further away than the center of curvature.

   5. halfway between the center of curvature and the lens

Answer 1

When the object is placed at ''2f'' location in front of the biconvex lens, a real image of same size forms at ''2f'' location behind the lens.

Answer: Put the object at twice the focal length from the lens.