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Brightfield refers to a type of microscopy and imaging technique in which the specimen is illuminated with a white light source, and the image is observed or captured against a bright background. In a bright-field microscope, the specimen appears darker against a bright background, providing high contrast for transparent or lightly stained samples.

Bright-field microscopy is a common and versatile technique, but it may have limitations in imaging transparent or low-contrast specimens. Other microscopy techniques, such as phase contrast, differential interference contrast (DIC), or dark-field microscopy, are often employed to enhance the visibility of certain structures or features that may be less apparent in traditional bright-field imaging.

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Contrast mechanism: Contrast in bright-field microscopy is generated by differences in light absorption and refractive index within the specimen. Dense or strongly absorbing areas appear darker, while less dense or more transparent regions appear brighter.

Staining: Bright-field microscopy is often used with stained specimens to enhance contrast. Stains can selectively bind to cellular structures or components, making them more visible under the microscope.

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Illumination: In bright-field microscopy, the entire specimen is illuminated with a broad, uniform light source. This can be achieved using a halogen lamp or similar white light source.

Bright-field microscopy is widely used in biology, medicine, and materials science for the examination of a variety of specimens, including cells, tissues, microorganisms, and thin sections of materials.

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Contrast = [(B1-B2)/B1] x 100, where B1 = LRV of the lighter area and B2 = LRV of the darker area.

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Objective lenses: Bright-field microscopes typically use a series of objective lenses with different magnifications to observe specimens at varying levels of detail.

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