. Problems in physics. Derived from military situations and experience . 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 combinatio
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. Problems in physics. Derived from military situations and experience . 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. Figure 8. Right Angle Prism 57. Is the image formed by a telescope with a lens erecting system perverted? 58. The erection of the image is to be accomplished by means of prisms. Should an even or an odd nimiber of reflections beemployed, if the image is to be unperverted? 59. If a telescope gives an erect and unperverted image, in what direction does the field move when the telescope is turnedto the right? 60. Is the relationship between movement of field and movement of telescope a natural one? 61. If the telescope gives an image erect, but perverted, in what direction does the field move when the telescope is moved tothe right? OPTICAL SYSTEMS 145 62. 63. 64. 65.