Physics
posted by Bob .
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?

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 
1sin(theta)=1.33sin (45)
(Theta)=sin^1 (0.940452019)
therefore Theta= 19.87 
1sin(theta)=1.33sin (45)
(Theta)=sin^1 (0.940452019)
therefore Theta=19.87 degrees
Respond to this Question
Similar Questions

physics
a boy stands on a cliff overlooking a lake below. He throws a rock at an initial velocity of 8.0m/s,at an angle 25 degrees above the horizontal. The lake's surface is 4.5 m lower than the point the rock was released. Find the speed … 
physics
A diver, below the surface of a lake, notices that no light appears to be coming toward her greater than the angle è, measured from the vertical. If the index of refraction of water is 1.33, what is the angle è (which is the critical … 
Physics
A submerged scuba diver looks up towards the calm water of a lake and notes that the Sun appears to be 20 from the vertical. The diver's friend, standing on the shore of the lake, is also looking at the Sun. At what angle from the … 
physics
Sunlight strikes the surface of a lake at an angle of incidence of 44.5°. At what angle with respect to the normal would a fish see the Sun? 
physics
Sunlight strikes the surface of a lake at an angle of incidence of 44.5°. At what angle with respect to the normal would a fish see the Sun? 
math?
how do i figuire this problem out? .. A deepsea diver must descend and ascend in short steps to equalize pressure on his body. If the diver rises toward the surface too fast, he may suffer from a physical condition called “the bends.” 
Physics
At the local swimming pool, the diving board is elevated h = 7.5 m above the pool surface and overhangs the pool edge by L = 2 m. A diver runs horizontally along the diving board with a speed of v0 = 3.4 m/s and then falls into the … 
physics
Assume all temperatures to be exact, and neglect significant figures for small changes in dimension. A diver releases an air bubble of volume 4.0cm3cm^3 from a depth of 16mm below the surface of a lake, where the temperature is 8.0∘C. … 
6th Grade Math
A deepsea diver must descend and ascend in short steps to equalize pressure on his body. If the diver rises toward the surface too fast, he may suffer from a physical condition called "the bends". Suppose the diver started at 82 feet … 
Physics
If a scuba diver is underwater and looks up, he or she will see a round "hole" directly above him or her at the surface of the water. The rest of the surface will look like a mirror. Explain this phenomenon.