Convex Lenses

• • When an object is placed at infinity, the real image is formed at the focus. The size of the image is highly diminished and point size.

• • When an object is placed beyond the centre of curvature, the real image is formed between the centre of curvature and focus. The image size will not be the same as the object. It will be diminished in size..

• • When an object is at the centre of curvature, the real image is formed at the other centre of curvature. The size of the image is the same as compared to that of the object.

• • When an object is placed in between the centre of curvature and focus, the real image is formed behind the centre of curvature. The size of the image is larger than that of the object.

• • When an object is placed at the focus, a real image is formed at infinity. The size of the image is much larger than that of the object.

• • When an object is placed in between focus and optical centre, a virtual image is formed. The size of the image is larger than that of the object.

Concave Lenses

• • When an object is placed at infinity, a virtual image is formed at the focus. The size of the image is highly diminished and point size.

• • When an object is placed at a finite distance from the lens, a virtual image is formed between the optical centre and the focus of the convex lens. The size of the image is smaller than that of the object.