. Problems in physics. Derived from military situations and experience . Figure 6. One Meter Horizontal Base Range Finder. OPTICAL SYSTEMS 143. Figure 7. Porro Prism PRISMS 50. If the reflection of a printed page is viewed in a mirror, the letters are observed to be reversed. This is commonlyspoken of as perversion of the image. Is the image per-verted after a single reflection in a prism? 51. Is it perverted after two reflection? 52. Is the image perverted after an odd number of reflections? 53. Is the image perverted after an even number? 54. Is the real image formed by a lens perverted? 55.
. Problems in physics. Derived from military situations and experience . Figure 6. One Meter Horizontal Base Range Finder. OPTICAL SYSTEMS 143. Figure 7. Porro Prism PRISMS 50. If the reflection of a printed page is viewed in a mirror, the letters are observed to be reversed. This is commonlyspoken of as perversion of the image. Is the image per-verted after a single reflection in a prism? 51. Is it perverted after two reflection? 52. Is the image perverted after an odd number of reflections? 53. Is the image perverted after an even number? 54. Is the real image formed by a lens perverted? 55. Is a virtual image formed by a lens perverted? 56. Does any combination of lenses ever pervert an image? 144 PROBLEMS IN PHYSICS
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