what are the factors affecting the focal length of a lens
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The principal focal length of a lens is determined by the index of refraction of the glass, the radii of curvature of the surfaces, and the medium in which the lens resides. It can be calculated from the lens-maker's formula for thin lenses.
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Those factors are - the absolute refractive index of the material with which the lens is made up of, the absolute refractive index of the surrounding, the radius of curvature of the first spherical refracting surface and the radius of curvature of the second spherical refracting surface.
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