. Problems in physics. Derived from military situations and experience . Figure 9. Roof Prism Is the relationship between movement of field and movementof telescope a natural one ? Which type of telescope would be more advantageous for lay-ing a gun, that of Problem 59 or 61 ? In general, what statement may we make regarding the numberof reflections which light must undergo in a military tele-scope? In the drawing of a right angle prism, BA is a ray incidentnormally upon the face of the prism and emerging after areflection on the hypothenus face. Will there be total re-flection if the index of
. Problems in physics. Derived from military situations and experience . Figure 9. Roof Prism Is the relationship between movement of field and movementof telescope a natural one ? Which type of telescope would be more advantageous for lay-ing a gun, that of Problem 59 or 61 ? In general, what statement may we make regarding the numberof reflections which light must undergo in a military tele-scope? In the drawing of a right angle prism, BA is a ray incidentnormally upon the face of the prism and emerging after areflection on the hypothenus face. Will there be total re-flection if the index of the glass is 146 PROBLEMS IN PHYSICS f\. Figure 10. Penta Prism 66. CA is a second incident ray (not traced through the prism) lying in the plane ABCD and making an angle CAB withthe ray BA. What is the maximum value of angle CAB, iftotal reflection is to be secured at the hypothenus face? 67. Suppose we have any other ray, incident at A, making an angle with BA less than or equal to this maximum value,but not lying in the plane ABCD, will it be totally reflected? 68. What limit does this set upon the maximum angular value of the field which may be viewed, fully illuminated, by meansof an unsilvered right angle prism? 69. What is the limit for a prism made of glass with an index of reflection of 70. Will this angular extent of field be increased if flint glass, with an index of refraction of , is used? 71. What will the angular extent of field be for glass? 72. Can the field of a right angle prism be increased by silvering the hypothenuse face? OPTICAL SYSTEMS 147 73. The roof prism bends a ray, incident norma
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