Image Formation by a Convex Lens when Object is at 2F

When an object is placed at twice the focal length (2F) of a convex lens, the image formed is real, inverted, and the same size as the object. This is a special case known as the "2F rule".

- Formation of Image:
- In this scenario, the light rays from the object are refracted by the convex lens and converge at a point on the opposite side of the lens.
- The image is formed beyond the 2F point on the side of the lens where the object is placed.

- Real Image:
- The image formed is real because the light rays actually converge at a point where the image is formed.
- This means that the image can be projected onto a screen and is visible.

- Inverted Image:
- The image formed is inverted, which means that the top of the object corresponds to the bottom of the image and vice versa.
- This is a characteristic of images formed by convex lenses.

- Same Size Image:
- The size of the image formed is the same as the size of the object.
- This is because the object is placed at 2F, resulting in an image that is not magnified or diminished.

In conclusion, when an object is placed at twice the focal length of a convex lens, a real, inverted, and same-sized image is formed. This rule is important in understanding the behavior of convex lenses and image formation.