On Jul 15, 6:29*pm, Quadibloc wrote:

But since a gold-coated primary, _in itself_, doesn't preclude using
the JWST to obtain images in blue, green, and ultraviolet light - the
brightness of which can be adjusted to compensate for the lower
reflectivity of gold at those wavelengths - if it *can* be designed to
avoid being limited to working at wavelengths longer than a limit such
as 720 nm or 560 nm, I would think it is worth the effort.

John Savard

http://www.platinummetalsreview.com/...se&record=1219