The staff reading at adistance of 80m from a level withthe bubble at the centre is 1.52mand when the bubble moved 5division out of the centre - thereading is 1.6m the angularvalue of 1 division of bubble is:

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The staff reading at adistance of 80m from a level withthe bubble at the centre is 1.52mand when the bubble moved 5division out of the centre - thereading is 1.6m the angularvalue of 1 division of bubble is: