Question

the radius of cone for a fish at a depth h inside the water to see out side world is​

Answer 1

Answer:

Explanation:

If you wonder why there would be circle then try to recall critical angle, if incident angle is beyond that particular angle there would be total internal reflection, so the fish won't be able to see the outside world.

So, as to obtain the radius. We need to take the last light ray into consideration which can enter the eyeball of fish. So, here we'll use critical angle.

Using snell's law

sinisinr=μ2μ1

r=90° ;sinr=1 & μ2=1

sini=143=34

tani=3√7

; radius=36√7 better written as 36√77