抄録
According to the theory of polanret microscope, it is expected that we can vary the phase difference and the intensity ratio of the diffracted and the direct rays of the polanret microscope to any desired values, independently of each other. But, this is permissible only when there is no errors of manufacture in the micoid disc of the microscope. If we take the errors of this disc into account, above assumption is no longer true. In this paper, we studied the effects of errors introduced in the micoid disc upon the function of the polanret microscope. It was found that the effect of error in λ/4-plate (deviation of retardation from λ/4) upon the intensity ratio becomes maximum when the phase difference is π/2. This is the worst effect, as the polanret microscope is used at π/2 most frequently. All other effects become zero or minimum when the phase difference is π/2. Graphs showing the results of calculations are given to determine the limits of the tolerable errors in the micoid disc.
