11. The derivations of the ray matrices of a convex spherical mirror and a thin lens are very similar. 12. This sculpture first appears in Escher's 1934 lithograph " Still Life with Spherical Mirror ". 13. :: This reminds me of when I learned how to grind a spherical mirror to use in a telescope. 14. A convex spherical mirror is positioned so that its center of curvature coincides with the focus of the lens being tested. 15. You can't see that from the spherical mirror , because the body of the apple blocks it from view. 16. With the digital immersive projection system which throws extraordinarily bright light onto a spherical mirror tuned to the exact shape of our dome. 17. Why not consider the similar but more symmetric question of what you see if you put your head inside a hollow spherical mirror ? 18. Surely its obvious that were are looking at a spherical mirror , and hence the angle of the mirror will vary across its surface. 19. After seeing the result of what happens when two mirrors face each other, I wondered what things would look like inside a spherical mirror . 20. In a focusing RICH detector, the photons are collected by a spherical mirror and focused onto the photon detector placed at the focal plane.