Electron Microscopist Question:

Phase Contrast microscopy:
A) Continuously changes the phase of the incident light from the condenser to improve contrast in the specimen.
B) Uses circular filters in the condenser and objective to give contrast to parts of the cell with different refractive indices.
C) Uses special lenses to distinguish between solid and liquid phases of the cell.
D) Uses special lenses to change the color of light passing through them