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

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Cooling or heating binoculars can affect the transmitted image due to changes in the refractive index of the materials involved. The refractive index is influenced by temperature, which can alter the focus, similar to the effects seen in telescopes. The electron density, which impacts the refractive index, is affected by the lens density and the differential thermal expansion between the lens and its housing. Therefore, temperature variations can lead to noticeable changes in image quality. Proper understanding of these effects is crucial for optimal binocular performance.
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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 ?
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You mean, does the refractive index of materials change with temperature?
 
It will probably change the focus - happens with telescopes.
 
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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