Focal lengthof lens formula

Focal length is a measurement of the distance between the center of a lens and the point where light rays converge to form a clear image. It is typically measured in millimeters (mm) and is an important factor in determining the magnification and field of view of a lens.

Edmund Optics offers a variety of Fresnel Lenses designed for visible or infrared applications. For maximum performance, the grooved side of a Fresnel Lens should face the longer conjugate. For example, when used with detectors, the grooved side should face away from the detector. Contoured lenses are available to improve focusing performance or spot size. Cylinder Fresnel Lenses are also available to focus in only a single dimension.

What isfocal lengthof lens

Please select your shipping country to view the most accurate inventory information, and to determine the correct Edmund Optics sales office for your order.

The focal length of a lens is a fixed characteristic and cannot be changed. However, the field of view and magnification can be altered by using different lenses or adjusting the distance between the lens and the image sensor.

Fresnel Lenses are used in many light collection applications, such as condenser systems or emitter/detector setups. Fresnel Lenses are optical lenses consisting of a series of concentric grooves etched into a plastic substrate. Each groove acts as an individual refracting surface, while the thin substrate minimizes the amount of light lost due to absorption. High groove density increases image quality, while low groove density increases the overall efficiency. Fresnel Lenses are typically not used as magnifier or projection lenses due to high levels of distortion.

Howtocalculate focal lengthof convex lens

The focal length of a lens is directly related to its magnification power. A shorter focal length results in a wider field of view and less magnification, while a longer focal length results in a narrower field of view and greater magnification.

The size of the image sensor can affect the effective focal length of a lens. A larger sensor will capture a wider field of view and result in a shorter effective focal length, while a smaller sensor will capture a narrower field of view and result in a longer effective focal length.

Focal length can be calculated by dividing the distance from the lens to the image sensor (or film) by the distance from the lens to the subject. This is known as the thin lens equation: 1/f = 1/di + 1/do, where f is the focal length, di is the distance from the lens to the image sensor, and do is the distance from the lens to the subject.