For a convex lens to form a real image, the distance between the object and the screen will be:

Chrisbridge

1 year ago

The correct option is B.

You do not need to place an object at twice the focal length of the lens for a real image to be formed.

HERE ARE THE POSITION AND NATURE OF IMAGES FORMED BY A CONVEX LENS

1. Object at infinity
image is formed at the principal focus, highly diminished, real and inverted

2. Object beyond 2F
image is formed between F' and 2F', diminished, real and inverted

3. Object at 2F (twice the focal length of the lens)
image is formed at 2F', same size as object, real and inverted

4. Object betwen F and 2F
image is formed beyond 2F', enlarged, real and inverted

5. Object F
image is formed at infinity, highly enlarged, real and inverted (required answer starts from here upward)

6. Object betwen F and optical centre
image is formed on the same side as object, enlarged, virtual and upright (only point where a real image cannnot be formed)

NOTE:
Case 5 and Case 6 cannot be captured on the screen