Will cooling or heating a pair of binoculars change the transmitted image?

[ndvcxk123]

TL;DR

The permittivity (epsilon) of glass+ water cause the angle change of a beam entering. How much is this change in angle under extreme temperature change, is it visible to the naked eye ?

Thanks!

 

[Ibix]

You mean, does the refractive index of materials change with temperature?

 

[russ_watters]

It will probably change the focus - happens with telescopes.

 

[Vanadium 50]

ε depends on the electron density, which depends on the lens density, which depends on the differential thermal expansion of the lens and the tube it is in.