Talk:Herschel wedge

Limitations don't make sense
The explanation of why you can't use a wedge with a reflecting telescope doesn't make sense. It says the reflector focuses all wavelengths at one point (which it does) and a glass refractor lets all wavelengths through. But I can't see the practical difference between these two situations. Stub Mandrel (talk) 18:26, 1 July 2015 (UTC)