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Q & A: Parallel light rays going through lenses

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Most recent answer: 10/22/2007
Q:
What happens to a beam of parallel ligh that passes through a convex lens, and what happens to a beam of parallel ligh that passes through a concave lens?
- Cloe (age 14)
Peter Moyes Anglican Community School, Australia
A:
Hi Cloe,

Light rays change direction when they pass through the boundary between one material and another, if the indexes of refraction (related to the speed of light in the material) are different in the two materials. Here is  of how parallel light rays interact with convex and concave lenses on our web site.

Tom

(published on 10/22/2007)

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