Find distance l required to make the effective focal length

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Reference no: EM13272460

Two lenses of focal length f1 and f2, made from the same glass, are spaced by distance L. The effective focal length of the pair is related to refractive index n by
f^(-1) = (n-1)a + (n-1)b - L((n-1)^2)ab
where a,b are constants. Find the distance L required to make the effective focal length independent of wavelength, thereby making the lens combination achromatic.

Reference no: EM13272460

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