Lens Maker Equation The lens maker formula for a lens of thickness d and refractive index \[\mu\] is given by, \[\frac{1}{f}\] = (\[\mu\] - 1) \[\left [ \frac{1}{R_{1}} - \frac{1}{R_{2}} + \left ( 1 - \frac{1}{\mu} \right ) \frac{d}{R_{1} R_{2}}\right ]\] Lens manufacturers use this relation to construct a lens of a particular power. Lens-Maker's Formula. This can be substi- tuted into the lens equation as follows: 1 u + 1 v = 1 f) 1 6 + 1 v = 1 3 1 v = 1 3 1 6 = 2 6 1 6 = 1 6 So v= 6cm. It can also be used to calculate image distance for both real and virtual images. Thus, 1 f = (n −1) 1 R1 + 1 R2 , (9) which is the lensmaker’s formula. The lens maker formula is a relation between the focal length, the refractive index of constituent material, and the radii of curvature of the spherical surfaces of a lens. When a convex surface faces the object, we say its radius of curvature is positive. The sign of is determined by the location of the center of curvature along the optic axis, with the origin at the center of the lens. The question states that u= 6cmand f= 3cm. The refractive power (inverse of focal length) can be computed from this formula. A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction.A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (elements), usually arranged along a common axis.Lenses are made from materials such as glass or plastic, and are ground and polished or molded to a desired shape. If the surface is facing away from the object, then we simply use the opposite sign of if the surface faced the object. This is the lens maker formula derivation. Substituting from the lens equation1 which relates the object and image distances to the focal length 1 o1 + 1 i1 = n− 1 R1. Writing the lens equation in terms of the object and image distances, 1 o + 1 i = 1 f. (8) But o1 and i2 are the object and image distances of the whole lens, so o1 = o and i2 = i. If the equation provides a negative image distance, then the image formed is virtual and on the same side as the object. Online equation editor for writing math equations, expressions, mathematical characters, and operations. The radius R 2 is negative since it extends left from the second surface. Check the limitations of the lens maker’s Now adding equation (1) and (2), When u = ∞ and v = f But also, Therefore, we can say that, Where μ is the refractive index of the material. (5) An equivalent analysis of the other half of the lens gives 1 o2 + 1 i2 = n− 1 R2. The lens maker’s equation is another formula used for lenses that give us a relationship between the focal length, refractive index, and radii of curvature of the two spheres used in lenses. The radii of curvature here are measured according to the Cartesian sign convention.For a double convex lens the radius R 1 is positive since it is measured from the front surface and extends right to the center of curvature. The lensmaker's equation relates the focal length of a simple lens with the spherical curvature of its two faces:, where and represent the radii of curvature of the lens surfaces closest to the light source (on the left) and the object (on the right). The Lens Maker’s Equation for Thin Lenses: \frac 1f ~= ~ (n-1) \left (\frac {1} {R_1}~-~ \frac {1} {R_2} \right) Lensmaker Equation is used to determine whether a lens will behave as a converging or diverging lens based on the curvature of its faces and the relative indices of the lens material and the surrounding medium. レンズの曲率と焦点距離の関係（レンズメーカーの式）-01 レンズがいかにして光を集光するかについては，ここ，でお示ししましたが， レンズの曲率と焦点距離との関係はどうなっているのだろう？ という点について考えていきたいと思います． The lensmaker's equation relates the focal length of a simple lens with the spherical curvature of its two faces: , where and represent the radii of curvature of the lens surfaces closest to the light source (on the left) and the object (on the right). The lens formula is applicable to both types of lenses - convex and concave. When a concave surface faces the object, we say its radius is negative. You can also generate an image of a mathematical formula using the TeX language. This is useful for displaying complex formulas on your web page. Section 2: The Lens Equation 7 Example 1 What image is produced by placing an object6cmaway from a convex lens of focal length3cm? Level 1, Example 1 - YouTube For a thin lens, the power is approximately the sum of the surface powers.. The radius of curvature can be positive or negative, depending on which way it curves and where it's facing 2. Example \(\PageIndex{1}\): Using the Lens Maker’s Equation Find the radius of curvature of a biconcave lens symmetrically ground from a glass with index of refractive 1.55 so that its focal length in air is 20 cm (for a biconcave lens, both surfaces have the same radius of curvature). (6) We can now 1 = −o2 From the ray diagram we see that this is an inverted, real image. Optics: Lens Maker's Equation. It is used for determining the focal length of a thin lens (thickness = … However, if the equation provides a negative focal length, then the lens is a diverging, not converging. 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