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A glass prothole is made at the botton of a ahip for observing sea life. The hole diameter D is much larger than the thickness of the glass. Determine the area S of the field of vision at the sea botton for the porthole of the refractive index of water is mu_(w) and the sea depth is h. |
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Answer» `rArr tani =(1)/(sqrt(mu_(w)^(2)-1))=(X)/(h)` `rArr x = (h)/(sqrt(mu_(w)^(2)-1))` Hence required area `s=pi(x+(D)/(2))^(2)` `=pi[(h)/(sqrt(mu_(w)^(2))-1)+(D)/(2)]^(2)` 
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