be rotated to select the required lens. These lenses are often color coded for easier use. The least powerful lens is called the scanning objective lens, and is typically a 4× objective. The second lens is referred to as the small objective lens and is typically a 10× lens. The most powerful lens out of the three is referred to as the large objective lens and is typically 40-100×.

Numerical aperture

Numerical aperture for microscope lenses typically ranges from 0.10 to 1.25, corresponding

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