When both jaws of vernier callipers touch each other, zero mark of the vernier scale is right to zero mark of main scale, 4^ th mark on vernier scale coincides with certain mark on the main scale. While measuring the length of a cylinder, observer observes 15 divisions on main scale and 5^ th division of vernier scale coincides with a main scale division. Measured length of cylinder is _ _ _ _ mm. (Least count of Ver

Step-by-step solution

Given Least Count ( LC ) = 0.1 mm. When jaws touch, the zero of the vernier scale is to the right of the main scale zero, indicating a positive zero error. Zero error ( e ) = + (n LC) , where n is the coinciding vernier division. e = +(4 0.1) = +0.4 mm. While measuring the cylinder: Main Scale Reading ( MSR ) = 15 divisions. Assuming 1 MSD = 1 mm (standard for LC = 0.1 mm), MSR = 15 mm. Vernier Scale Reading ( VSR ) = 5 LC = 5 0.1 = 0.5 mm. Observed Reading = MSR + VSR = 15 + 0.5 = 15.5 mm. True Measured Length = O