Room setup
Optical bench (light bulb closest to window)
Group bench riders together at end holding
bulb, arrow object, lens, screen
Detail of bulb, arrow object, lens
Note how all objects are at the same height!
Rider for arrow object is aligned with 5 cm mark. . .
. . . or aligned with 120 cm mark
Place 800-series lens in bench
Screen has index card side facing lens
Use a variac to control bulb brightness
Place "virtual image detector" on lab bench
Place a small mounted lens (marked with "A") on the lab bench
Place boxes of extra lenses up front