Functions of the Major Parts of a Optical Microscope Lamp and Condenser: project a parallel beam of light onto the sample for illumination Sample stage with X-Y movement: sample is placed on the stage and different part of the sample can be viewed due to the X-Y movement capability a Focusing knobs: since the distance between objective and eyepiece is fixed, focusing is achieved by moving the sample relative to the objective lensFunctions of the Major Parts of a Optical Microscope ▪ Lamp and Condenser: project a parallel beam of light onto the sample for illumination ▪ Sample stage with X-Y movement: sample is placed on the stage and different part of the sample can be viewed due to the X-Y movement capability ▪ Focusing knobs: since the distance between objective and eyepiece is fixed, focusing is achieved by moving the sample relative to the objective lens