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[–] 5 points 4 months ago (1 child)

I don't know shit about this, but some quick searching says that an air bubble would work better than glass as a lens underwater. The difference in refractive index is what creates the magnification effect:

Air: 1

Water: 1.3325

Glass: 1.52 (clear soda lime glass)

So .19 difference between water/glass, and .33 difference between air/water, making air/water the better magnifier.

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