# Why aren't superconductors shiny? [duplicate]

Superconductors are really good at conducting electricity. Should they not reflect light very well too?

• Super inductors are really good at conducting DC electricity. Jul 22, 2013 at 17:41
• Welcome to SE.physics. Before asking a question, better to check if it has not been answered. This question is the exact analogue of this one: physics.stackexchange.com/q/2409/16689 where it is discussed that superconductors are really good mirror for wave-energy below the superconducting gap. Jul 22, 2013 at 19:05

For tin far below the critical temperature, this frequency is roughly 2.7 $\times 10^{11}$ Hz according to BCS theory, which corresponds to a wavelength of about a millimeter, much longer than the wavelength of visible light.