profile-img
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_
  • 2 Answer(s)
  • like-1
  • 1 Likes
  • 4 Comments
  • Shares
  • 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
    • cropped622399282191287495.jpg
    Likes(0) Reply(3)
    Cosmopsy
    thank you sir
  • Saurabh shukla thankyou
    Here in eulers formula, V is for vertices , E for edges and F for faces....
    Likes(0) Reply(0)
  • Saurabh shukla
    Please find solution below... Rest I'm uploading sorry network problem here....
    • cropped4556482831241228906.jpg
    Likes(1) Reply(1)
    Cosmopsy
    thank you sir
  • Cosmopsy
    please help me with these questions
    Likes(1) Reply(0)