Chronology | Current Month | Current Thread | Current Date |
[Year List] [Month List (current year)] | [Date Index] [Thread Index] | [Thread Prev] [Thread Next] | [Date Prev] [Date Next] |
A student asked me a question that I couldn't answer. When I pick up the
black pen on my Smart Board, I can write with a really black color ---
much
blacker than the appearance of the screen with no illumination at all.
Where does the black come from? I can produce most all the other possible
colors with a combination of the primary colors of light, but if I add all
the colors of light together, it seems like I should get white, not black.
Any help?
_______________________________________________
Forum for Physics Educators
Phys-l@carnot.physics.buffalo.edu
https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l