After Galileo, telescope design moved forward but was stymied by the phenomena o

Question

After Galileo, telescope design moved forward but was stymied by the phenomena of chromatic abberation.
1. What were the first attempts to correct chromatic abberation? 2. The final solution for refractors was the achromatic telescope. What was this based on?
3. What is SETI trying to do?
After Galileo, telescope design moved forward but was stymied by the phenomena of chromatic abberation.
1. What were the first attempts to correct chromatic abberation? 2. The final solution for refractors was the achromatic telescope. What was this based on?
3. What is SETI trying to do?
After Galileo, telescope design moved forward but was stymied by the phenomena of chromatic abberation.
2. The final solution for refractors was the achromatic telescope. What was this based on?
3. What is SETI trying to do?

Explanation / Answer

1. Initially, chromatic aberration was reduced by increasing the focal length of the lens wherever required.There is a point called the circle of least confusion, where chromatic aberration can be minimized.

2. In achromatic, materials with different dispersion are assembled together to build compound lens. The most common one is an achromatic doublet, with elements made of crown and flint glass. This will reduces the amount of chromatic aberration over a certain range of wavelengths, though it does not produce perfect correction.

2.

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