Odd looking Principal Rays

[KatieWoe]

Test device
Dell
Operating System
Win 10
Browser
Chrome
Problem description
For phetsims/qa#667. Mostly an odd visual behavior. It is, however, correct from a physics stand point, so I don't think it is a bug, but a second design pass may be desired. Specifically, the rays passing through the middle of the screen and bending or reflecting, even when the lens or mirror isn't there.
Steps to reproduce

1. Go to either screen with any type of mirror
2. Turn on Principal Rays
3. Drag the object up above the lens or mirror

Visuals

Troubleshooting information:

!!!!! DO NOT EDIT !!!!!
Name: ‪Geometric Optics‬
URL: https://phet-dev.colorado.edu/html/geometric-optics/1.0.0-dev.1/phet/geometric-optics_en_phet.html
Version: 1.0.0-dev.1 2021-07-08 19:47:13 UTC
Features missing: applicationcache, applicationcache, touch
Flags: pixelRatioScaling
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36
Language: en-US
Window: 1280x657
Pixel Ratio: 1.5/1
WebGL: WebGL 1.0 (OpenGL ES 2.0 Chromium)
GLSL: WebGL GLSL ES 1.0 (OpenGL ES GLSL ES 1.0 Chromium)
Vendor: WebKit (WebKit WebGL)
Vertex: attribs: 16 varying: 30 uniform: 4096
Texture: size: 16384 imageUnits: 16 (vertex: 16, combined: 32)
Max viewport: 32767x32767
OES_texture_float: true
Dependencies JSON: {}

[veillette]

We will bring it up at our next design meeting (7/13)

[veillette]

We brought it up at the design meeting (7/13) . Assigning to @arouinfar to make design decision if needed.

[pixelzoom]

9/30/21 design meeting:

This will be handled by implementing #140. So closing.