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16 Optical power also referred as dioptric power refractive power focusing power or convergence power...

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16 Optical power also referred as dioptric power refractive power focusing power or convergence power is the degree to which a lens mirror or other optical system converges or diverges light It is equal to the reciprocal The SI unit for optical power is the inverse meter m which is commonly called the dioptre Converging lenses have positive optical power while diverging lenses have negative power When a lens is immersed in a refractive medium its optical power and focal length change of the focal length of the device i e P P High optical power Low optical power i What is the relation between the object distance u image distance v and power P in a lens a P uv u v b P c P UV V V d P U V UV UV ii Two thin lenses are kept near each other at a distance of 4 mm If the focal length of first and second lens are 20 cm and 25 cm respectively find the power of the combination a 7 6 D b 8 9 D c 7 6 D U V d 8 9 D iii A convex lens of focal length 20 cm made of glass is immersed in a liquid of refractive index 2 3 Its power will be a positive b can be positive or negative depending on the depth c zero d negative

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