It is used to absorb optical properties of minerals and study of crystals with birefringence Properies. The stage is compact ball-bearing stage, 140 mmdiameter, graduated with vernier, lock and stage specimen clips.Seprate knobs are provided for focusing adjustments. Concave mirror 50mm dia.15W lamp for 22V or 110V, Copensator - -Gypsum plate and 4 - Micra Plate, Objectives _ Achromatic, Semi-plan Objectives P -4X, P-10X and P-40X SL.Eyepieces - Widefield Eyepieces WF-10x and WF-10x with cross, Polarizer - fully Rotatable polarizer on strain free abbe-condensor N.A. 1.25 with iris-diaphragm in a box.