ࡱ> JLI`  jbjb <|c|cH8 HL.X'''-3------,0R2T-'#'''-y.yyy'8-y $0'-yy*- 3 ^,- .0L.*,\J3yJ30-yHH HH Geo 407 Lecture 03 - Relief, Becke Line Reading: p. 7-15 next: Ch. 3-4 Goals Finish Becke line Learn oblique illumination method Introduce idea of optical indicatrix Announcements Lab some sections were unavailable (leave blank, turn in what youve got) Note that email quiz scores are posted on the MyGrades database If you didnt get the email, then you should fix your setup to do so. Relief (Shagreen) Demonstrate differences in relief Why does this happen? Need to understand construction of thin section Grains are rough Light scattered at surfaces through refraction Angles of refraction depend on difference in n So, relief depends on n of medium Thin section epoxy has n=1.54 Relief can be high or low Depends on difference between nmineral & nmedium Relief can be positive or negative Depends on nmineral - nmedium Relief is different in different media Leads to immersion method for determining n Becke line [Demonstrate] Medium objective Low light (iris) Lower stage, and line moves into material with higher n Becke line is produced by two factors Reflection from vertical grain boundaries Lensing from curved grain boundaries Oblique Illumination Relies on same features as Becke line Partially obscure the light below the substage with a paper or card, and see where the shadows go. Need to calibrate your scope to be sure. Oblique Illumination Relies on same features as Becke line Partially obscure the light below the substage with a paper or card, and see where the shadows go. Need to calibrate your scope to be sure. 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