4. There is a circular tube in a vertical plane. Two liquids which do not mix and of densities d1 and d2​ are filled in the tube. Each liquid subtends 90 °  angle at centre. Radius joining their interface makes an angle  α  with vertical. Ratio  d 1 d 2  is


Dear Student,
                              The concept is that :The pressure at the interface must be same from both the sides to be equillibrium:d1gR(cosα -sinα) = d2gR(cosα +sinα)therefore :d1d2 = 1+tanα1-tanα


Regard

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