1. A relatively thin lens and relatively dilated pupil are also associated. 2. A Thin lens where black dimensions are real, grey are virtual. 3. Besides, the effect of the propagation in thin lens acts as a chirp multiplication. 4. :The thin lens equation in geometric optics is only approximate and assumes thin lens . 5. :The thin lens equation in geometric optics is only approximate and assumes thin lens. 6. In optics, a "'thin lens "'is a radii of curvature of the lens surfaces. 7. Thin lenses produce focal points on either side that can be modeled using the lensmaker's equation.8. That would be the " thin lens " that magically bends light, but has no thickness. 9. For a thin lens in air, the principal planes both lie at the location of the lens. 10. A further benefit is that when relatively thin lenses are placed close together their powers approximately add.