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Q.

A small rod ABC is put in water making an angle  6° with vertical. If it is viewed paraxially from above, it will look like bent shaped  ABC'. The angle of bending (∠CBC')  will be in degree is  (μw=43).

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a

4.5°

b

2°

c

3°

d

4°

answer is A.

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Detailed Solution

From figure, we get

Question Image

α=xOC and β=xOC'  ⇒αβ=OC'OC=1μ

 For small angles, we have   

β=μα=(43)(6°)=8°  ⇒ Bending angle=β−α=2°

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