- #1

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- Homework Statement
- Calculate the focal distance of the duplicate

- Relevant Equations
- Lensmaker's equation

The picture below shows a so-called chromatic doublet, which is designed to minimize chromatic aberration, ie the wavelength dependence of the refractive index of the glass. The first lens has a flat first surface and a concave second surface with radius of curvature R and index of refraction n1 . The second lens is double convex with curvature radius R (refraction index n2) and sits close to the first lens. The lenses can be considered thin.

Calculate the focal distance of the duplicate

My try:

I seem to be getting the wrong answer. What am i doing wrong?

Correct answer is R/(2*n2 - n1 - 1)

My try:

I seem to be getting the wrong answer. What am i doing wrong?

Correct answer is R/(2*n2 - n1 - 1)