- #1
fog37
- 1,568
- 108
Hello Forum,
In the case of an ideal, thin lens (free from any aberration), it does not matter which face of the lens is facing the object. The results will be identical.
What if the lens was an ideal (no aberration) thick less with the H planes, etc...? Would it matter which lens surface is facing the object? Would the effective focal length change if we turn the lens around?
If we considered aberrations, I know that in the case of a plano-convex lens, if the incoming illumination is collimated, it is better to have the curved surface face the source to reduce spherical aberration. A plano-convex is even better than a bi-convex lens with that type of illumination to reduce SA...
thanks
fog37
In the case of an ideal, thin lens (free from any aberration), it does not matter which face of the lens is facing the object. The results will be identical.
What if the lens was an ideal (no aberration) thick less with the H planes, etc...? Would it matter which lens surface is facing the object? Would the effective focal length change if we turn the lens around?
If we considered aberrations, I know that in the case of a plano-convex lens, if the incoming illumination is collimated, it is better to have the curved surface face the source to reduce spherical aberration. A plano-convex is even better than a bi-convex lens with that type of illumination to reduce SA...
thanks
fog37