Asked by shekhar14351 | 16th Feb, 2010, 09:50: AM

Expert Answer:

Dear Student

Depth of fish below water  h=12 cm
radius of the view         = r
Refractive index of water n=3/4

For total internal reflection to takeplace
n=sin (theta)=3/4
h,r are sides of a right angle triangle.
where the theta id the angle between hypotenues and h of teh triangle.

tan (theta)=r/h

cos (theta)= sqrt(1-sin^2(theta))= sqrt(1-9/16)=sqrt(7/9);

r=h sin(theta)/cos(theta)=12X (3/4)/sqrt(7/9)=9sqrt(7/9)=7.938 cm



Answered by  | 17th Feb, 2010, 02:32: PM

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