Learn vocabulary, terms, and more with flashcards, games, and other study tools. The objective lens of a microscope is the one at the bottom near the sample. High power (40x) objective : 4. When speaking of objective lenses in general, all types of lenses for cameras, microscopes, telescopes and binoculars are included. At its simplest, it is a very high-powered magnifying glass, with very short focal length. In an objective, the spot is the object under inspection and infinity points toward the eyepiece, or sensor if using a camera (Figure 12). objective α1 α2 n. A. max Air = 0,95 n. A. max Immersol/ Immersol HI ~ 1,46 ~ 1,57 - (n. A. max Monobromnaphtalene ~ 1,68 Toxic!) Microscope objective lenses 1. Types Microscope. Two Leica oil immersion microscope objective lenses; left 100×, right 40×. Objective properties: Immersion enables higher n.A. These are exposed lenses located at the lower end of the revolving nosepiece, and can either be forward or rear-facing. Types of Objective Lens & Their Function Light microscopes are relatively complex pieces of equipment in nature with multiple different parts, some of which are more complex than others. Scanning (4x) objective: 2. Start studying Types of objective lenses. Objective lenses. The objective lens is the primary optical lens of any type of light or bright field microscope. Immersion prevents light rays from being deflected between two materials, e.g. Low power (10x) objective: 3. Typical values of objectives are x5, x10, x20, x40, x80 and x100. The lenses of the microscope are fundamental to its function as they provide the magnification power that allows the microscopic specimen to be seen or observed in greater detail. The objective lens - a cylinder containing one or more lenses to collect light from the sample. between objective front lens and coverglas More order maxima of the diffracted light This type of modern design utilizes an additional tube lens between the object and eyepiece in order to produce an image. An objective lens is a series of glass lenses (or one single lens at the front of the viewing object) through which light that is bounced off of an object is collected and concentrated into one specific image. At the lower end of the microscope tube one or more objective lenses are screwed into a circular nose piece which may be rotated to select the required objective lens. There are hundreds of unique objective lenses to choose from, but once you have a greater understanding of the most common types, you can make a more informed decision regarding which lens is right for you. 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