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An image is formed by a convex lens when rays of light converge after passing through the lens. This forms a real image on the opposite side of the lens. The position and size of the image depend on the distance of the object from the lens and the focal length of the lens.
A real and inverted image is formed by a convex lens when the object is at infinity. The image is located at the focal point of the lens.
The image of the tree formed by the convex lens is virtual, upright, and magnified.
Both a concave lens and a convex mirror can produce virtual and diminished images. The images formed are located behind the lens/mirror and are upright.
When an object is at infinity from a convex lens, the image will be formed at the focal point of the lens. The image will be a real and inverted point of light.
When the object is placed at 2F in front of a convex lens, the image is formed at 2F on the other side of the lens. This is known as the "2F" image formation of a convex lens. The image is real, inverted, and the same size as the object.