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170 RICHARDSON'S BLUEBOOK OF PROJECTION
25. What is meant by Free Diameter with reference to lenses?
26. What is Incidence?
27. By what means are lenses corrected?
28. What is a light ray, or a ray of light?
29. What is a Meniscus Lens?
30. Optically, what does the term Perpendicular mean ?
31. What is meant by the Plane of a lens?
32. Describe a piano convex lens.
33. What is the Principal Axis of a lens ?
34. What is the Projection Angle?
35. What is Refraction and what causes it ?
36. What is meant by a Simple Lens?
37. What is Spherical Aberration?
38. What is meant by Working Distance of a projection lens?
39. What difference is there between Working Distance and Back Focus?
Lens Action, page 185
40. Upon what is lens action wholly based?
41. Does each pin-point of the surface of a lens refract light differently ?
42. Does a light ray change its course while passing through the body of a lens ?
43. Upon what three things is lens action upon light dependent ?
44. If a ray of light meets both surfaces of a lens exactly at right angles what will happen?
45. If a light ray meets a lens surface at an angle what happens?
46. Explain the various points in connection with Fig. 33.
Image Formation, page 188
47. Examining Fig. 79, explain how the image of object X is formed.
48. Are uncorrected lenses faulty and how may they be corrected ?
Focal Length, page 189
49. What is meant by the focal length of a simple lens ?
50. By what elements of a lens is focal length chiefly affected ?