Definition

1. Noun:
   • The optical component in an instrument that is closest to the object being observed: The "object lens" is the primary lens or lens assembly in a telescope or microscope that first receives light from the object. It is responsible for gathering light and forming the initial image.

Usage

• The "object lens" is a technical term used primarily in the context of optical instruments like microscopes and telescopes. It is often synonymous with the term "objective" or "objective lens."
• It is used to specify the part of the instrument that faces the specimen or celestial body.

Examples

• Noun:
  • The quality of the object lens determines the resolution and clarity of the microscopic image.
  • Astronomers cleaned the telescope's large object lens to remove dust particles.

Advanced Usage

• "To adjust the object lens": To change the focus or position of the primary lens to obtain a clear image.
  • You must carefully adjust the object lens to bring the specimen into sharp focus.

Variants and Related Words

• Objective lens (n): A more common synonym for "object lens," referring to the same optical component.
  • The microscope's objective lens has a magnification of 40x.
• Objective (n): A shortened form often used in technical contexts.
  • The telescope has a 10-inch objective.

Synonyms

• Objective: The lens or mirror in an optical system that first collects light.
• Front lens: A descriptive term indicating its position.

Related Phrases

• Object lens assembly: The complete housing and mechanism containing the object lens.
  • The object lens assembly was carefully calibrated.

Noun

1. the lens or system of lenses in a telescope or microscope that is nearest the object being viewed