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Question
What if a ray of light is made to pass through a lens made up of several materials packed in layers? By several materials I mean a lens made up of materials having different refractive indices.

Answer
This is quite common in modern camera lenses to reduce what is known as "chromatic abberation."  That basically means the misfocusing of different colors of light.  At each interface between the layers, the light will refract according to Snell's law.  http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/refr.html#c3

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Dr. Stephen O. Nelson

Expertise

I can answer most basic physics questions, physics questions about science fiction and everyday observations of physics, etc. I'm also usually good for science fair advice (I'm the regional science fair director). I do not answer homework problems. I will occasionally point out where a homework solution went wrong, though. I'm usually good at explaining odd observations that seem counterintuitive, energy science, nuclear physics, nuclear astrophysics, and alternative theories of physics are my specialties.

Experience

I was a physics professor at the University of Texas of the Permian Basin, research in nuclear technology and nuclear astrophysics. My travelling science show saw over 20,000 students of all ages. I taught physics, nuclear chemistry, radiation safety, vacuum technology, and answer tons of questions as I tour schools encouraging students to consider careers in science. I moved on to a non-academic job with more research just recently.

Education/Credentials
Ph. D. from Duke University in physics, research in nuclear astrophysics reactions, gamma-ray astronomy technology, and advanced nuclear reactors.

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