Some findings
1. In the refraction texture we define, the variable called refractionratio of the material is actually the (refractive index of air/ refractive index of lens).
2. Then if we increase refractive index, refractionratio decreases. When refractionratio increases, the focal length also increases. So the behaviour of the lens and the refraction ratio is in accordance with the real world and the lens makers formula.
3. We can use any material with refractive index > 1 and we would get a good behaviour.
4. As the radius of curvature increases, the focal length increases as well.
5. When we put the object at a distance at less than the focal length we get no(virtual) image.

Progress.........

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