Posted by **Bob** on Tuesday, June 5, 2012 at 9:48pm.

At what angle to the surface must a submerged diver in a lake look toward the surface to see the setting sun just along the horizon?

- Physics -
**drwls**, Wednesday, June 6, 2012 at 3:01am
Let A be the required angle to the VERTICAL.

Snell's law says that, in this case,

N sin A = 1*sin 90 = 1

sin A = 1/N = 0.75

A = 48.6 degrees

where N is the refractive index of water.

The angle they want is 90 - A

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