F. H. Richardson's bluebook of projection (1935)

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LENSES 1. Why must the projectionists understand certain laws relating to light action ? 2. Recite the law dealing with light from open sources. 3. Examining Fig. 30, what effect would you say has distance from an open light source upon a surface to be covered by the light ? 4. Does light travel in straight lines ? v — 5. Under what circumstance does a light ray change its course ? 6. What effect has distance from an open light source upon brilliancy of illumination? 7. What optical train is particularly difficult? ,; • 8. What does the first optical system of a motion picture projector do? 9. What is the second optical system of a projector and what does it do ? .Cen^fa+u* ~<ry^M(^ Definitions, page 104 ^^^j^^ J ~~ 10. What is the Angle of Incidence? — 11. What is meant by Angle of Refraction? 12. What is meant by Barrel Distortion? i — o 15. What is meant by Collector Lens? 16. Describe a compound lens. 17. What does the term Conjugate Foci mean? 18. What is meant by Converging Lens? 19. In projection optics what is meant by a Condenser? -20. What is Chromatic Aberration? -21. What is meant by Equivalent Focus? 22. Do the faults in a simple lens alter its focal length ? 23. What is meant by Critical Angle? 24. What does the term Focal Length mean? 25. What is meant by Free Diameter with reference to lenses? 26. What is Incidence? 92 13. What is a plano-convex and a bi-convex lens? 14. What is meant by Brilliancy ?