This is because the oil scatters light in a similar manner to the glass slide that the specimen is on, which helps to direct the light to the objective, creating a more clear image. Make sure the cond...This is because the oil scatters light in a similar manner to the glass slide that the specimen is on, which helps to direct the light to the objective, creating a more clear image. Make sure the condenser is all the way up and the iris diaphragm is all the way open, letting the maximum amount of light to contact your slide.
