Microscopy

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LYC_4613 R005 10x quartz melatope optic axis interference figure conoscopic bertrand lens retardation plate lambda uniaxial positive petrographic thin section microscopy rock geology Singapore Bukit Gombak Little Guilin

microscopy microscope transmitted light brightfield diascopic illumination conoscopy conoscopic interference figure isogyre melatope fourier transform bertrand lens back focal plane objective 530nm tint plate compensation plate retardation magenta uniaxial positive quartz cross polarized light crossed polarizers xpl anisotropic anisotropy birefringence birefringent interference colour optical mineralogy petrographic thin section petrography petrology geology rock mineral