## What is a reflective objective?

Reflective Objectives are microscope objectives that use two mirrors to form an image or focus a laser in a variety of imaging or laser applications. Reflective Objectives can also be coated for additional performance over a specific wavelength range or laser line.

## What are the four lenses of the objective?

Magnification: Your microscope has 4 objective lenses: Scanning (4x), Low (10x), High (40x), and Oil Immersion (100x).

**What is a Cassegrain objective?**

A Cassegrain Objective consists of a concave primary mirror and a convex secondary mirror. The working distance is defined from the vertex of the primary mirror to the image plane. For the purposes of this problem, assume that the mirrors have zero thickness. The object is at infinity.

### What are the types of objective lenses?

What Are the Different Magnifications of Objective Lenses?

- Scanning Objective Lens (4x)
- Low Power Objective (10x)
- High Power Objective Lens (40x)
- Oil Immersion Objective Lens (100x)
- Specialty Objective Lenses (2x, 50x Oil, 60x and 100x Dry)

### What is an infinity corrected objective?

An infinity-corrected objective is a system where a light beam coming from a specimen goes through the objective lens (and does not create an image) and comes out as an infinity parallel beam through the tube lens which then creates an intermediate image.

**What is the shortest objective lens?**

A scanning objective lens that magnifies 4x is the shortest objective and is useful for getting a general overview of a slide. A low-power objective lens magnifies 10x, but remember that it is coupled with an eyepiece lens, so the total magnification is 10x times the power of the eyepiece lens.

## Who uses Cassegrain reflecting telescopes?

Cassegrain designs are also utilized in satellite telecommunication earth station antennas and radio telescopes, ranging in size from 2.4 metres to 70 metres. The centrally located sub-reflector serves to focus radio frequency signals in a similar fashion to optical telescopes.

## What are the 3 types of objectives lenses?

Essentially, objective lenses can be categorized in to three main categories based on their magnification power. These include: low magnification objectives (5x and 10x) intermediate magnification objectives (20x and 50x) and high magnification objectives (100x).

**What is the shortest objective lens called?**

scanning-power objective lens

After the light has passed through the specimen, it enters the objective lens (often called “objective” for short). The shortest of the three objectives is the scanning-power objective lens (N), and has a power of 4X, Color the 4X objective black.

### What is Newport reflective microscope objectives?

Designed as a reverse Casegrain, Newport Reflective Microscope Objectives focus light using reflective surfaces that are broadband coated with a usable wavelength range from 200 nm to 20 µm. Loading… Loading… Loading… Loading… Loading…

### What is a reflective objective lens?

Additionally, we offer reflective objective lenses that focus light in a reverse Cassegrain design using reflective surfaces. Objective lenses can be used for various applications such as high magnification and spatial filtering.

**What is the f-number of the reflective microscope objective?**

REFRACTIVE LENS REFLECTIVE MICROSCOPE OBJECTIVE F-number 2.8 to 8 1.25* Numerical Aperture 0.18 to 0.06* 0.4 Focal length 50.2 mm 160 mm (back) 13 mm (effective) Working distance – 24 mm Magnification 1 15 Transmission 400-700 nm 200-1000 nm Refractive Reflective

## What is a finite conjugate reflective objective?

Objectives with a finite BFL – also known as finite conjugate reflective objectives – are ideal for imaging applications that do not require an additional lens for focusing. A) Diagram of a typical focusing application of a reflective microscope objective.