Question

At what distance from a convex lens should an object be placed to get an image of the same size as that of the object on a screen?

Options

• Beyond twice the focal length of the lens.

• At the principal focus of the lens.

• At twice the focal length of the lens.

• Between the optical centre of the lens and its principal focus.

Answer 1

At twice the focal length of the lens.

Explanation:

Consider using a magnifying glass to project an image onto a screen. To ensure the image on the screen is the same size as the real object, position it at the appropriate distance from the lens. The item must be twice the distance from the lens's focus point to use a magnifying glass with a curved lens. This ensures that the image remains consistent with the original size.