Bright Field Microscopy is a common optical microscopy technique used to observe transparent or stained specimens. It works by illuminating the sample with white light, which passes through the specimen and is then magnified by the objective lens. The contrast in the image is created by the differences in light absorption, allowing for the visualization of cellular structures. This method is widely used in biological and medical research, as it provides clear images of cells and tissues. However, it may not be suitable for very thin or transparent samples without staining, as the details can be difficult to discern without sufficient contrast.