Difference between Concave vs Convex ... Condition 2: When the object is placed at a finite position, a virtual image is formed between the pole and the focus of the concave lens.

Draw a ray which passes from the object through the centre of the lens. Some ray diagrams may also show a third ray. Peep holes contain concave lenses. They are set into doors so the occupant can ...

The centre of the lens is called the optical centre C. In a ray diagram ... formed by a convex lens depends on the lens used and the distance from the object to the lens. 2.