Diverging Lens Ray Diagram. A ray diagram for the case in which the object is located in front of the focal point is shown in the diagram at the right. To see why this is so a ray diagram can be used.
Use the slider to set the position of the object. A ray proceeding parallel to the principal axis will diverge as if he came from the image focal point f. Any incident ray of light that passes through the focus of the lens before getting refracted will emerge parallel to the principal axis on refraction.
You can use all 3 principal rays but in reality you only really need 2 in order to find the image l.
Ray diagrams are constructed by taking the path of two distinct rays from a single point on the object. You need any two to fix the position of the image. A ray diagram for the case in which the object is located in front of the focal point is shown in the diagram at the right. Any incident ray of light that passes through the focus of the lens before getting refracted will emerge parallel to the principal axis on refraction.
