Lenses form images by refracting light and changing its direction.
- A converging lens is a convex-it bulges outwards.
- causes parallel rays of light to converge (move together) at the principal focus.
- The principal focus of a converging lens is where rays hitting the lens parallel to the axis all meet
- A diverging lens is a concave-it caves inwards
- Causes parallel rays of light to diverge.
- The principle focus is the point where rays hitiing the lens parallel to the axis appear to all come from-you can trace them back until they all appear to meet up at a point behind the lens.
Rules for Refraction
- An incident ray parallel to the axis refracts through the lens and passes…