Horace,
I feel like I am falling into a trap here but a blue filter
restricts all wavelengths but blue.
Best Regards
Fran
If white light shines through a blue glass window how would you
describe the process and result?
Best regards,
Horace Heffner
http://www.mtaonline.net/~hheffner/
BTW below is the reference re
Recent work by Christian Beck at the University of London and Michael
Mackey at McGill University may have resolved the 120 order of magnitude
problem. In that case dark energy is nothing other than zero-point
energy. Measurability of vacuum fluctuations and dark energy
<http://arxiv.org/abs/astro-ph/0605418> and Electromagnetic dark energy
<http://arxiv.org/abs/astro-ph/0703364> they propose that a phase
transition occurs so that zero-point photons below a frequency of about
1.7 THz are gravitationally active whereas above that they are not.
