A rectangular glass slab is a transparent optical element with:
- A rectangular shape (four sides, four right angles)
- Flat, parallel surfaces (top and bottom)
- Straight edges (four sides)
- Equal thickness throughout
- Typically made of glass or another transparent material
A rectangular glass slab has:
- Length (L): the longer side
- Width (W): the shorter side
- Thickness (T): the distance between the two parallel surfaces
- Refractive index (n): a measure of how much light is bent as it passes through the slab
