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August 2018    Download the Entire Issue (PDF) Vol. 33, No. 8   RSS Feed for Undercurrent Issues
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Not All Magnifying Glasses Will Spot Critters

from the August, 2018 issue of Undercurrent   Subscribe Now

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You've seen all the big fish, so for your next dive trips, you want to focus on macro and super-macro marine life . But to enjoy the very colorful but typically tiny creatures that your dive guide will search out and point to, you may need the help of a magnifying glass .

Light is refracted when it passes from a dense medium (the water) to a less dense medium (the air in your mask), making things look larger or closer . But when light passes from a less dense medium (the water) through a more dense medium (the glass in a magnifying glass), the opposite happens, counteracting the effect of the convex lens' curved surface . ...


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