A spectrometer gives the following reading when used to measure the...

A spectrometer gives the following reading when used to measure the angle of a prism. Main scale reading: $58.5$ degree Vernier scale reading : $09$ divisions Given that $1$ division on main scale corresponds to $0.5$ degree. Total divisions on the vernier scale is $30$ and match with $29$ divisions of the main scale. The angle of the prism from the above data