To determine refractive index of a liquid by measuring the critical angle. It comprises a bridge 150 x 100 x 75 mm, air cell 40 x 30 mm held by detachable spring clips, (air cell consists of two glass plates held parallel at small distance apart in a frame). Air cell holder is attached to a knob carrying pointer with scale graduated 0-360°. Supplied without tank.
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Mahesh Nagar, Ambala, Haryana