Concentrates light on specimen Diaphram . Regulates amount of light Objective . 10X magnification High dry power objective. 40X magnification Oil immersion objective. 100X magnification Ocular .
Stains are dyes that bind to cells Two main purposes.
1. Make microorganisms and the components of their cells easier too see with a light microscope Unstained cells have poor contrast and are difficult to see 2. Simple stain . Differential stain . Two or more dyes are used Used to distinguish between different types of microorganisms Gram stain . Acid-fast stain .