Use the slider bar to twist the angle of the block.
You can highlight the first or second surfaces of the block.
You can change the number of beams striking the lens to help clarify what you're seeing.
Use the slider bar to twist the angle of the mirror to see how it reflects the beam.
You can change the number of beams striking the mirror to help clarify what you're seeing.
Click and drag the lens (or mirror) and screen around to find focused images.
Use the magnified view to focus small images.
