Lenses 2: DIVERGING LENSES

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Presentation transcript:

Lenses 2: DIVERGING LENSES

Concave Lenses A diverging lens is sometimes called a concave lens because it is thinner in the centre than at the edges. As parallel light rays pass through a concave lens, they are refracted away from the principal axis. The light rays diverge and they will never meet on the other side of the lens. The image formed is always upright, virtual and smaller than the object

Drawing a Concave Lens Ray Diagram Any two of the following rays may be used to locate the image: Draw a ray parallel to the principal axis that is refracted through the principal focus (F). Draw a ray that passes through the secondary principal focus (F') and refracts parallel to the principal axis. A ray that passes through the optical center goes straight through, without bending. Only two of these lines are needed to find the image

Drawing a Concave Lens Ray Diagram 2F F F’’ 2F’ S: Smaller A: Upright L: In front of F T: Virtual

Concave Lenses