Convex lens – object between `2F` and `F`

This means that the object is between two principal focal lengths and one principal focal length from the convex lens.

As in the previous section, we use the two ray diagram rules.

From the object, pass a parallel line through the principal focal point
From the object, pass a ray line through the centre of the convex lens

Ray diagram of object that is closer to 2F than F

Ray diagram of an object roughly halfway between 2F and F

Ray diagram of an object closer to F than 2F

From the above diagrams we can observe that all the images are located beyond two principal focal points (`2F`) on the other side of the convex lens. All the images are larger than the object and can be much larger as they approach one principal focal length (`F`). All the images are inverted and although you may need a giant screen they can all be focused on that screen.

An object between 2F and F will produce an image on the opposite side of the lens that is inverted, larger and real

In summary this would be:

Ray diagram of 4 objects between 2F and F

Or to make it really simple:

More simplified ray diagram of 4 objects between 2F and F of a convex lens

Or as a block diagram:

Block diagram of objects between 2F and F