How small can a prism be made?

[mr magoo]

See video: http://www.youtube.com/watch?v=M7mXdgF2grY"

The concept of the video is the light is directed. Right now I'm using a plano-convex lens but I'm looking at right angle prisms (not the rainbow kind).

- How small can a right angle prism be made?
- And my other question is for after you watch the video at youtube: would a right angle prism only have one beam sent instead of the two the plano-convex lens is emitting now?

My goal is to know if I can fit 7 right angle prisms over the space of a single plasma pixel.
I'm interested if this is possible in theory.

 

[mr magoo]

Television displays have dpi; one inch square that fits 96 pixels square.

1 inch = 25.4 millimeters
The right angle micro prism can be made as small as 0.18mm, Leg Length and Width.

(25.4 millimeters) / (0.18 millimeters) = 141.111111

So, I can fit only one right angle prism over every pixel in a 96 dpi/ppi area, and not several.
If the dpi were 20.14285714285714, then I could fit several 0.18mm, Leg Length and Width right angle micro prisms over every pixel.