[list]Choose the refractive indices value by moving the n[sub]1[/sub] and n2 cursors.Choose the position of the object by dragging point O.Choose the curvature of the surface by dragging the blue dot on top of the grey curve.The values ​​of the radius of curvature r, the object coordinate o, the image coordinate i and the magnification A are presented.[/list]

[br]1. When is refraction on spherical surfaces convergent or divergent?[br]2. What kind of images are produced by divergent refractions? What about the convergent ones?[br]3. Can you verify the validity of the Refracting Surface Equation?[br]4. When is the secondary focus to the right of the refracting surface? When is it on the left?[br]5. What about the primary focus?[br]6. Are any of the foci located at the midpoint between the center of curvature and the apex?[br]7. On which side of the surface are virtual images formed? What about the actual images?[br]8. Is it possible to form a real and upright image?