Anukruti posted an Question
October 02, 2020 • 01:44 am 30 points
  • IIT JAM
  • Geology (GG)

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    Sajan sarthak best-answer

    2 fold 360/2= 180°. 1 fold 360°. 3 fold 360/3 =120°. 4 fold is 360/4=90°. answer is 2fold

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    Rahul kumar Best Answer

    Answer: B. 2-fold symmetry n-fold axis of symmetry means that the crystal will appear unchanged when the crystal will be rotated by (360/n)° For 1 fold symmetry: Crystal will appear unchanged when it will be rotated by (360/1) = 360° For 2 fold symmetry: Crystal will appear unchanged when it will be rotated by (360/2) = 180° For 3 fold symmetry: Crystal will appear unchanged when it will be rotated by (360/3) = 120° For 4 fold symmetry: Crystal will appear unchanged when it will be rotated by (360/4) = 90°

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