A scuba diver uses his waterproof flashlight to shine a beam of light so that it strikes the surface of the water at an angle of incidence θi. Use Snell’s law to find the angle of incidence that would give an angle of refraction for the refracted ray to be directed right along the surface, and show that θi is the same as the critical angle for total internal reflection.
Stacey Warren - Expert brainly.com
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Well, you're not exactly given any specific values here, so I can't really help you either than give you some formulas to take a look at
Hope this helps!
@CShrix That's what's confusing, is that there are no values :/ But I'll look at those formulas (: Thanks anyway!
go down to this part of the wiki article where they solve the problem for you