The lens closest to the object.  In a stereo (low power) microscope there are objective pairs, one lens for each eyepiece lens.  This gives the 3-D effect.  On a high power binocular model there is still only one objective lens so no stereo vision.

In a refracting telescope the objective lens is the large lens which collects the dim light from objects in the night sky. The purpose of the objective is to collect as much light as possible. It does [..]

SP In a refracting telescope the objective lens is the large lens which collects the dim light from objects in the night sky. The purpose of the objective is to collect as much light as possible. It [..]

The lens closest to the specimen that first receives light emitted by the light source and forms an image in the focal plane of the eyepiece. Objective lenses are designed to maximize the ultimate resolution of the microscope.

The lens in a microscope closest to the specimen. In a compound microscope there are usually 3, 4 or 5 objective lenses allowing a selection of magnification levels. Top

The lens at the front end of the binocular away from the eye that gathers the light presented to the eye. The diameter of the objective lens is the second number listed in binocular specs—a 10×42 binocular has 42mm-diamter objective lenses.

The most important lens in a microscope and the one closest to the specimen. In a compound microscope there are usually 3, 4 or 5 objective lenses allowing a selection of magnification levels. Fo [..]

The front lenses of a scope. Usually expressed in millimeters. Scope most often have 32-50 mm diameter objective lenses.

The second of two figures quoted on a pair of binoculars that indicates the diameter of the lens furthest away from your eye when you're looking through them. It's quoted in millimeters and [..]