As light from an object refracts as it passes througha a converging or diverging lenses it bends, allowing up to see images.

###### An Introduction to Lenses

This short video covers some of the terminology you need to know when learning about lenses over the next few videos.

###### Converging vs Diverging

Converging (convex) and diverging (concave) lenses explained.

###### Power of a Lens

The more powerful a lens is, the more bending ability it has.

###### Magnification of a Lens

The magnification can be calculated by dividing the image height by the height of the object. We can also calculate it as the ratio of 'v' to 'u'.

###### The Lens Equation

You may be familiar with the equation linking 'f', 'u' and 'v'. In this videos I show you where this equation comes from.

###### Images in a Converging Lens - Part 1

When an object is far away from the lens (greater than the focal length) then the image will appear upside down. In this video I show you how to construct a ray diagram to find out where it will form.

###### Images in a Converging Lens - Part 2

Object closer than the focal length will appear enlarged and 'virtual'. this is how.

###### Images in a Diverging Lens

Finally, this is how objects appear when viewed through a diverging lens.