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**Lenses
Ray Diagrams and Calculations**

**Introduction
to Lenses Concave and Convex**

**Part
1 Explains the basics of lenses and images**

**Lens
Image Characteristics Concave and Convex**

**Part
2 How to describe an image**

**Ray
Diagrams For a Convex Lens**

**Part
3 How to find an image using a ray diagram**

**More
Ray Diagrams for Convex Lenses**

**Part
4 Shows all the possibilities for this type of lens**

**Part
5 Diagrams for Convave Lenses**

**Part
6 Shows when to use (+) or (-) in the lens formula**

**Lens
Formula Sample Calculation**

**Part
7 Shows a sample calculation using the 2 lens formulas**