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

  • #1
ndvcxk123
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TL;DR Summary
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!
 
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  • #2
You mean, does the refractive index of materials change with temperature?
 
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  • #3
It will probably change the focus - happens with telescopes.
 
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  • #4
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.
 
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