Physics 3 - 13.4 Mirrors and Lenses
- Created by: Matilda Haymes
- Created on: 17-05-12 15:41
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Ray Diagrams
- A horizontal line passing through the centre of the lens is called the principal axis
- A ray of light entering the lens parallel to the principal axis will be refracted through the principal focus of the lens, f
- A ray through the principal focus mergers parallel to the principal axis
- A ray through the centre of lens passes straight through without refracting
- Rays of light from infinity are parallel
Magnification
- A converging lens acts as a magnifying glass when the object is closer than its focal length
- The thing that you look at is called the object. What you can see is the image:
magnification = image height / object height
An image is described by its magnification, whether it is upright or inverted relative to the object and whether it is real or virtual:
- a real image is formed when rays…
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