19
votes
Accepted
How deep under water can humans open their naked eyes without damaging them?
Crushing damage from pressure occurs due to pressure differences. Imagine you have a rigid container. If you have equal gas pressure inside and outside, the pressure acts on just the walls and the ...
- 44k
13
votes
How deep under water can humans open their naked eyes without damaging them?
Goggles do not, cannot, protect eyes from pressure. The pressure on both sides of goggles should be nominally the same. In fact, divers tend to use a mask, which communicates with the nose, to be able ...
- 231
9
votes
How deep under water can humans open their naked eyes without damaging them?
Currently the record for the deepest dive wearing scuba equipment is 332.35m. The descent took only 15 minutes while the ascent lasted 13 hours 35 minutes.
Liquids do not compress, so the sinuses, ...
- 10.3k
3
votes
Accepted
Laser in mirror experiment
Obligatory - Don't shine lasers into your eyes, you only have one set and run the risk of permanent eye damage!
We have dominant eyes, just like we have dominant hands and feet. This means that with ...
- 11.2k
2
votes
Is harmonic resonance in Photoreceptors explored?
Vision works by a pigment molecules changing conformation by absorbing a photon. A certain range of energies is necessary for this conformation change.
More generally, molecules can potentially absorb ...
- 44k
2
votes
Is harmonic resonance in Photoreceptors explored?
I think a few things are muddled here. The frequency response profile of a cone (which is an entire cell) is a functional response to excitation of that cell's photoreceptors. It's easy to show that ...
- 1,511
2
votes
Accepted
Why do humans see exactly one octave of light?
It isn't really true that the human eye sees "exactly one octave of light".
The visible spectrum does not have precise boundaries, so the choice of "350-700 nm" is a bit arbitrary ...
- 136
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