Answer: The correct option is c : The condenser
Explanation: Importance of the parts present in a light microscope:
1. Stage: It is a place where the specimen is kept.
2. Objectives: They are the primary optical lenses present on a microscope. these can be forward or rare-facing.
3. Condenser: It collects all the light from the illuminator and focuses on the specimen present on stage.
Hence, the correct option is C.
