State the function of the following parts of a microscope: a) Fine adjustment knob. b) Mechanical stage. c) Nose piece. d) Condenser.

a) Fine adjustment knob: The fine adjustment knob is used to make small, precise adjustments to the focus of the microscope to bring the specimen into sharp clarity.

b) Mechanical stage: The mechanical stage is a platform on which the specimen slide is placed and can be moved horizontally and vertically with precision controls to allow for easy and accurate positioning of the specimen under the objective lens.

c) Nose piece: The nose piece holds and rotates the objective lenses, allowing the user to easily switch between different magnifications without having to manually change the lenses.

d) Condenser: The condenser is a lens system located beneath the stage that focuses light onto the specimen to provide better contrast and resolution. It also helps to concentrate and direct the light onto the specimen for optimal illumination.

a) Fine adjustment knob:
- Moves the stage up or down in fine increments for precise focusing.

b) Mechanical stage:
- Holds and moves the slide in the x-y plane for specimen positioning.

c) Nose piece:
- Rotates multiple objective lenses into alignment with the optical path.

d) Condenser:
- Concentrates and directs light onto the specimen to provide optimal illumination and contrast.