<p>The glass core of an optical fiber has an index of refraction 1.65. The index of refraction of the cladding is 1.50.
What is the maximum angle a light ray can make with the wall of the core if it is to remain inside the fiber?</p>
<p>I think its looking for Total Internal Reflection which is
sin(angle)=(n2)/(n1)
where n2 is the material it would have gone into and n1 is the material its remaining in.</p>
<p>so with that problem, I think its arcsin(1.50/1.65)</p>
<p>An underwater diver sees the sun 57 degress above horizontal.
How high is the sun above the horizon to a fisherman in a boat above the diver?</p>
<p>no, the answer is not 65.38 degrees</p>
<p>For the second question, I’m pretty sure you have to know how far underwater the diver is… unless I am just stupid, which is a very real possibility.</p>
<p>come on cc…</p>