Chapter: 10th Science : Chapter 2 : Optics
Lens Maker’s Formula
All lenses are made up of transparent materials. Any optically transparent material will have a refractive index. The lens formula relates the focal length of a lens with the distance of object and image.
LENS MAKER’S FORMULA
All lenses are made up
of transparent materials. Any optically transparent material will have a
refractive index. The lens formula relates the focal length of a lens with the
distance of object and image. For a maker of any lens, knowledge of radii of
curvature of the lens is required. This clearly indicates the need for an
equation relating the radii of curvature of the lens, the refractive index of
the given material of the lens and the required focal length of the lens. The
lens maker’s formula is one such equation. It is given as
where µ is the
refractive index of the material of the lens; R1 and R
2 are the radii of curvature of the two faces of the lens; f is the
focal length of the lens.
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10th Science : Chapter 2 : Optics : Lens Maker’s Formula |
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10th Science : Chapter 2 : Optics