In a screw gauge, the zero of the circular scale lies \( 3 \) divisions above the horizontal pitch line when their metallic studs are brought in contact. Using this instrument thickness of a sheet is measured. If pitch scale reading is \( 1 \, \text{mm} \) and the circular scale reading is \( 51 \) then the correct thickness of the sheet is ______ \( \text{mm} \). [Assume least count is \( 0.01 \, \text{mm} \)]
