What is Power of Lens?
The ability of a lens to bend light is really what gives it its power in Ray Optics. The greater a lens’s strength, the greater its ability to refract light passing through it. Power defines the converging ability of a convex lens and the diverging ability of a concave lens. The number of light bends increases as the focal length reduces. As a result, we can assume that the strength of a lens is inversely proportional to its focal length. A short focal length, in essence, leads to high optical power. Thus,
P = 1 / f
Here, P is the power of the lens and f is the focal length of the lens. If the focal length is given in meters (m), the power of the lens is calculated in Diopters (D), as the lens’s unit of power is diopter.
Power of a Lens
One of the most fascinating ideas of ray optics is the power of a lens. Simply stated, a lens’s capacity to bend light is its strength in Ray Optics. The ability of a lens to refract light that passes through it is proportional to its power. The converging ability of a convex lens is defined by its strength, while the diverging ability of a concave lens is defined by its diverging ability.
The focal length of a lens is inversely proportional to its intensity. High optical strength is aided by a short focal range. Therefore, let’s first discuss some basic concepts related to the power of the lens.