Which objective lens magnification is commonly associated with immersion oil?

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Multiple Choice

Which objective lens magnification is commonly associated with immersion oil?

Explanation:
Immersion oil is used with high-magnification objective lenses to maximize light gathering and resolution. The oil has a refractive index close to glass, so it fills the gap between the slide and the lens and reduces refraction at that interface. This increases the numerical aperture, which directly improves resolving power. In practice, oil immersion is paired with the 100x objective, making that magnification the most commonly associated with immersion oil. The lower magnifications listed are typically dry objectives that don’t use oil, so they don’t rely on this oil-medium setup.

Immersion oil is used with high-magnification objective lenses to maximize light gathering and resolution. The oil has a refractive index close to glass, so it fills the gap between the slide and the lens and reduces refraction at that interface. This increases the numerical aperture, which directly improves resolving power. In practice, oil immersion is paired with the 100x objective, making that magnification the most commonly associated with immersion oil. The lower magnifications listed are typically dry objectives that don’t use oil, so they don’t rely on this oil-medium setup.

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