Frequently Asked Questions (FAQ)

• 1. What is the role of the Compensators in this microscope? The compensators (Gypsum, Mica, Quartz Wedge) are inserted into the light path to determine the **optical sign** of a crystal (positive or negative) and to measure the degree of **birefringence** by introducing a known path difference to the polarized light.
• 2. Why must the objectives be 'Strain-Free'? Strain-free objectives are critical because any residual stress (strain) in the objective glass itself would cause its own birefringence, which would interfere with and distort the light passing through the actual specimen, leading to incorrect measurements.
• 3. How is the Trinocular port used in polarizing microscopy? The Trinocular port allows a camera to be attached, enabling the capture of high-resolution images and videos of interference figures and colours. This is vital for quantitative analysis using image software (e.g., measuring extinction angles) and for digital documentation in reports and research papers.
• 4. What kind of samples are typically viewed under a Polarizing Microscope? Generally, the samples are **anisotropic** (showing double refraction). Common samples include rock thin sections, mineral powders, synthesized crystals, textile fibers, thin polymer films, and certain pharmaceutical compounds. Isotropic materials (like glass or liquids) appear dark.
• 5. Is the Circular Rotating Stage mandatory for analysis? Yes. The **360° Rotating Stage** is essential because many key measurements (like the extinction angle) require rotating the specimen relative to the fixed polarizer and analyzer until the material appears completely dark (extinction). This rotational capability is fundamental to polarized light microscopy.