# Will a reflection phase change work regardless of wavelength?

If I have a gamma photon traveling in air and it shoots off towards a glass mirror and bounces off it, when I measure its phase, will it have changed by 180${}^\circ$?

I was reading the wikipedia article on reflection phase change and it says

Light waves change phase by 180° when they reflect from the surface of a medium with higher refractive index than that of the medium in which they are travelling. A light wave travelling in air that is reflected by a glass barrier will undergo a 180° phase change [...]

But I didn't know if wavelength of the photon changes that.

• Considering their frequencies are on the order of $10^{19}$ Hz, and our best timing devices are only accurate to 1 part in $10^{18}$, probably not directly. That said, detecting the relative phase of two gamma rays is simple - just have them interfere and measure the amplitude. – probably_someone Jul 18 '17 at 21:08