OBJECT: To determine the dispersive power of the material of the prism mercury light with the help of a spectrometer. APPARATUS REQUIRED: Spectrometer, prism, mercury source and reading lens. FORMULA USED:99981231160000-0800 The dispersive power − = −1 , of the material of the prism is given by the formula Where

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 correspods to `0.5` degree.