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The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power. A positive focal length indicates that a system converges light, while a negative focal length indicates that the system diverges light.
Learn how to calculate and measure the focal length of a lens, and how it relates to the lens strength and power. Explore the effects of spherical and chromatic aberration on the focal length and lens performance.
The focal length f is positive for converging lenses, and negative for diverging lenses. The reciprocal of the focal length, 1/f, is the optical of the lens. If the focal length is in meters, this gives the optical power in diopters (inverse meters).
The distance from the center of the lens to the focal point is the focal length, ƒ, of the lens. An expanded view of the path taken by ray 1 shows the perpendiculars and the angles of incidence and refraction at both surfaces.
The distance from the center of the lens to its focal point is the focal length f of the lens. Figure \(\PageIndex{2}\): Rays of light entering (a) a converging lens and (b) a diverging lens, parallel to its axis, converge at its focal point F.
Focal Length: The distance between the lens and the image sensor when the subject is in focus. It involves three components: Lens, Image Sensor, and Focus. Focal Length Formula: It is represented as f = 1/(1/d_o + 1/d_i) where 'f' stands for focal length, 'd_o' is the object distance and 'd_i' is the image distance.
The focal length of a lens is a fundamental parameter that describes how strongly it focuses or diverges light. A large focal length indicates that light is bent gradually while a short focal length indicates that the light is bent at sharp angles.
