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A periscope’s two plane mirrors, tilted at 45 degrees, redirect light using

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1. A periscope’s two plane mirrors, tilted at 45 degrees, redirect light using

Refraction, so a denser medium inside the tube would shift the image

Total internal reflection at the tube’s outer walls

Reflection, so the image is unaffected by the medium filling the tube

Diffraction of light at the mirror edges

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