Cosmopsy Asked a Question
December 19, 2020 8:42 pmpts 30 pts
1. Which one of the following defines a hexagonal dipyramid? (A) A vertical six fold axis of symmetry (B) A horizontal mirror plane (C) Six vertical mirror planes at an angle of 30° with each other (D) A mirror plane that is perpendicular to the vertical six fold axis of symmetry 2. If (326) is the Miller Index of a crystal face. then the value ofx in the corresponding Weiss Parameter of the same face, xa: yb: zc is 3. The retardation of a uniaxial negative mineral of thickness 0.03 mm is 5160 nm in its principal section of indicatrix. If the refractive index corresponding to the E-ray is 1.486. the value of the refractive index (correct to three decimal places) of the O-ray is _-- 4. If a crystal contains 5 faces and 8 edges., the number of vertices in the crystal is_
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  • Sajan sarthak Best Answer
    1.For the hexagonal pyramid 4 the option is the correct answer. 2.X=2 3. refractive index of Oray is 1.314 4.5 vertices
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    thank you sir
  • Saurabh shukla thankyou
    Here in eulers formula, V is for vertices , E for edges and F for faces....
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  • Saurabh shukla
    Please find solution below... Rest I'm uploading sorry network problem here....
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    thank you sir
  • Cosmopsy
    please help me with these questions
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