If the objective lenses of a microscope can be changed without losing focus on the specimen, they are said to be

If the objective lenses of a microscope can be changed without losing focus on the specimen, they are said to be

If the objective lenses of a microscope can be changed without losing focus on the specimen, they are said to be 









A. equifocal.
B. totifocal.
C. parfocal.
D. optifocal.












Answer: C