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

1. α − α + cos 1 cos 1
2. α − α + tan 1 tan 1
3. α − α + cos 1 sin 1
4. α − α + sin 1 sin 1

Correct answer: α − α + tan 1 tan 1

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