16 - Negative relief 12/2/10 12/2/10 Total internal...

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12/2/10 Optical microscopy
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12/2/10 Petrographic Microscopes Leica Olympus Nikon
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12/2/10 Sedimentary Rocks under the petrographic microscope
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12/2/10 Igneous Rocks under the petrographic microscope extrusive intrusive plane polarized light crossed polars
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12/2/10 Metamorphic Rocks under the petrographic microscope
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12/2/10 Light as a particle Light as a wave
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12/2/10 Fig. 7.9
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12/2/10
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12/2/10
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12/2/10 FIG. 1.9a
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12/2/10 n=1.33
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12/2/10
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12/2/10 Becke Line Test
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12/2/10 --- rule of thumb --- medium with higher RI acts like a bi-convex lense and converges light towards its centre when stage is lowered away from the objective lens SO --- Becke line test --- negative (-) relief (<oil it’s in) or positive (+) relief (>oil it’s in) Index of refraction of mineral > Index of refraction of oil Positive relief Index of refraction of oil > Index of refraction of mineral Negative relief
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12/2/10 Positive relief
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Unformatted text preview: Negative relief 12/2/10 12/2/10 Total internal reflection 12/2/10 12/2/10 Diamond --- highest dispersive power Fluorite --- least dispersive power 12/2/10 12/2/10 12/2/10 FIG. 1.11 Abnormal dispersion 12/2/10 POLARIZATION AND POLARIZED LIGHT 12/2/10 12/2/10 12/2/10 12/2/10 12/2/10 three important methods to produce plane polarized light 1. by reflection and refraction Obj1 4 12/2/10 12/2/10 2. by absorbtion 12/2/10 3. by double refraction Obj1 5 12/2/10 12/2/10--- in a polarizing microscope--- two polarizers--- one --- below stage converting natural light into E-W vibration plane --- polarizer--- one --- above objective --- analyser with N-S vibration plane 12/2/10 Analyzer Polarizer 12/2/10 Plane Polarized Light- analyzer out 12/2/10 Crossed Polarized Light-analyzer in 12/2/10 12/2/10 12/2/10 12/2/10 Opaque minerals. Are always black even in PPL...
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16 - Negative relief 12/2/10 12/2/10 Total internal...

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