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Question

A straight rod is partially immersed in water (μ=1.33). Its submerged portion appears to be inclined at 45o with the surface when viewed vertically from air. The actual inclination of the rod is?

A
32.14o
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B
45o
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C
57.9o
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D
62o
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Solution

The correct option is C 57.9o
Given: A straight rod is partially immersed in water (μ=1.33). Its submerged portion appears to be inclined at 45o with the surface when viewed vertically from air.
To find the actual inclination of the rod
Solution:
We know,
μ=sinisinr1.33=sin(45)sinrsinr=121.33r=sin1(0.53)=32.11
Is the angleof refraction.
So the actual inclination is 90r=9032.11=57.9

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