GLY 4200CName 14 points December 2, 20108 students took examNumbers to the left of the questions (in red) are the points missed.LAB FINAL EXAMINATION Closed NotesTrue-False- Print the letter T or F in the blank to indicate if each of the following statements istrue or false. Illegible answers are wrong. (1 point each)0T 1. In parallel extinction, J= 0°.0F 2. Twinning can be observed only under plane polarized light.1T 3. 3° red is higher than 3° blue.1T 4. Albite twins may appear wedge-shaped (thicker at one end) if the twinning resultsfrom deformation. 6F 5. Carlsbad twinning is a type of polysynthetic contact twinning.0F 6. Interference colors are seen only in plane polarized.0T 7. Minerals with a very high, or extremely high relief always have the index of refractiongreater than the mounting medium.1T 8. Inclined extinction is possible only in biaxial crystals. 2T 9. Along an "optic axis" in an anisotropic substance light will behave isotropically and agrain will remain in extinction between crossed nicols.
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