(adsbygoogle = window.adsbygoogle || []).push({}); Answered on: 2017/12/15 by ExamFear Education     refractive index of medium is greater than refractive index of lens). For refraction at surface XP2Y : I1 is the virtual object and I is its real image which is the final image. c) The aperture of the lens is small. radius of curvature R = R. 7. Using the formula, n1 / v – n2 / u = n1 – n2 / R1, we get, n1 / v – n2 / v1 = n1 – n2 / R2 -------------------Eqn (2), Adding equations (1) and (2), we get n1 (1/v – 1/u) = (n2 – n1)(1/R1 – 1/R2), Divide both sides by n1 we get, (1/v – 1/u) = (n2 – n1)/n1 (1/R1 – 1/R2), 1/f = (1/v – 1/u) = (n2/n1 – 1) (1/R1 – 1/R2), 1/f = (1/v – 1/u) = (n – 1) (1/R1 – 1/R2), Answered on: 2017/12/15 by ExamFear Education. According to image formation on curved surface (adsbygoogle = window.adsbygoogle || []).push({}); Derivation: c) The aperture of the lens is small. Place a thin lens (which is made of one convex surface and one concave surface) between two refractive indices. 4. Tags: Class 10 , Physics , Light Reflection Refraction Asked by Rah 1 Answers. 1. We hope this clarifies your doubt. The lens maker's formula indicates that a convex lens can behave like a diverging one if m1 > m2 i.e., if the lens is placed in a medium whose m is greater than the m of lens. Assumptions: convex surface. we get,  n2 / v1 – n1 / u = n2 – n1 / R1 -------------------Eqn (1) Derivation for lens makers formula It is a relation between the focal length of a lens to the refractive index of its material and the radii of curvature of its two surfaces. 3. Local action: ➡Zinc plate contains carbon an... 1. It is so called because it is used by lens manufacturers to make lenses of particular power from the glass of given refractive index. Let n a ... 1. Consider an object O placed on the principal axis (iv) The angle made by incident ray and refracted ray with the principal axis are small. The image Q of object O due to the convex surface is taken as the object for Derivation. Assumptions made to derive Lens maker formula : (i) The lens is thin and all the distances are measured from the optical centre of the lens. Polarization 1. 8. R1 and R2 are the radii of curvature of surfaces XP1Y and XP2Y respectively. 1 Answers 1/f = (1/v – 1/u) = (n – 1) (1/R1 – 1/R2) Answer this Question 1/f = (1/v – 1/u) = (n2/n1 – 1) (1/R1 – 1/R2) The convex lens act as converging lens (if 5. Place a thin lens (which is made of one convex It is a relation between the focal length of a lens to the refractive index of its material and the radii of curvature of its two surfaces. b) The object is a point object which is situated on the principal axis. For refraction at surface XP1Y : O is the object and I1 is its real image. 2. There are two defects in voltaic cell. Consider a thin convex lens made of a material of absolute refractive index n2 , placed in a rarer medium of absolute refractive index n1. d) The incident as well as refracted ray makes small angle with the principal axis. There is a fish inside the water. The lens is thin so that the distance measured from the poles of the two surfaces of the lens can be taken to be equal to the distances measured from the optical centre. Consider a thin convex lens made of a material of absolute refractive index n2 , placed in a rarer medium of absolute refractive index n1. After getting refracted at point A again the ray Object distance PQ = u = x, Image distance = PI = v, This is called lens maker s formula. Adding equations (1) and (2), we get n1 (1/v – 1/u) = (n2 – n1)(1/R1 – 1/R2) the concave surface. Using the formula for refraction at a single spherical surface we can say that, For the first surface, For the second surface, 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. radius of curvature = -R, 1. The lens is thin so that the distance measured from the poles of the two surfaces of the lens can be taken to be equal to the distances measured from the optical centre. The convex lens acts as diverging lens (if Also, n = n2 / n1 be the refractive index of the material of the lens with respect to the medium surrounding it. It is so called because it is used by lens manufacturers to make lenses of particular power from the glass of given refractive index. (ii) The aperture of the lens is small. A platform to get information of physics and chemistry... A bird is flying down vertically towards the surface of water in a pond with constant speed. get refracted due to concave surface at point B and reaches on the principal Lens makers formula: It is a relation between the focal length of a lens to the refractive index of its material and the radii of curvature of its two surfaces. Divide both sides by n1 we get, (1/v – 1/u) = (n2 – n1)/n1 (1/R1 – 1/R2) Using the formula, n1 / v – n2 / u = n1 – n2 / R1 Local action 2. 1/f = (n - 1) (1/R1 – 1/R2) is the equation of Lens Maker’s Formula. The Lens Maker’s Equation for Thin Lenses: \frac 1f ~= ~ (n-1) \left (\frac {1} {R_1}~-~ \frac {1} {R_2} \right) (iii) The object is a point object and lies on the principal axis. surface and one concave surface) between two refractive indices. Similarly a concave lens can be made convergent. Also, n = n2 / n1 be the refractive index of the material of the lens with respect to the medium surrounding it. For refraction at surface XP2Y : I1 is the virtual object and I is its real image which is the final image. of the thin lens. For refraction at surface XP1Y : O is the object and I1 is its real image. 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. If that fish is exactly vertically below the bird, then the bird will appear to the fish to be. axis at point I. : Answer, Tags: Class 10 , Physics , Light Reflection Refraction     Asked by Rah. R1 and R2 are the radii of curvature of surfaces XP1Y and XP2Y respectively. Using the formula, n2 / v – n1 / u = n2 – n1 / R1 we get, n1 / v – n2 / v1 = n1 – n2 / R2 -------------------Eqn (2) Derivation for lens makers formula . formula. Question: A bird is flying down vertically towards the surface of water in a pond with constant speed. d) The incident as well as refracted ray makes small angle with the principal axis. The complete derivation of lens maker formula is described below. There is a fish inside the water. Lens makers formula: Using the formula, n2 / v – n1 / u = n2 – n1 / R1, we get,  n2 / v1 – n1 / u = n2 – n1 / R1 -------------------Eqn (1). b) The object is a point object which is situated on the principal axis. Now consider a ray from object O incident on the refractive index of medium is less than refractive index of lens), 2. 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