0
Bertrand lens An accessory lens which may be inserted into the light path above the analyser in a transmitted-light microscope. When determining vibration directions or interference figures using parallel or convergent polarized light, the Bertrand lens is inserted to bring the image of the interference figures into focus. Alternatively, if the Bertrand lens is absent, the eyepiece may be removed and the vibration directions or interference figures observed by looking down the microscope tube. The lens was first used in 1878 by E. Bertrand who adapted an original (1844) design by G. B. Amici. In petrological Refractive Microscopes its applicability is more to determine the Mineral type by identifying the interference figures. it shows whether the mineral is Uniaxial or Biaxial and also +ve or _ve.
What else can I help you with?
What is the function of the lens in an electron microscope?
The lens in an electron microscope focuses and magnifies the electron beam to produce high-resolution images of tiny objects.
Since the lens is made of protein what effect does preserving fluid in the lab have on the structure of the lens?
Preserving fluid in the lab can cause protein denaturation in the lens, leading to changes in its structure. This can result in alterations to the transparency and refractive properties of the lens, affecting its overall function.
What is the function of the condenser lens on the micrscope?
The condenser lens focuses and directs light onto the specimen on the microscope slide. It helps to illuminate the specimen evenly and improve contrast and resolution for clearer imaging. Adjusting the condenser lens controls the brightness and sharpness of the image.
What is the function of biconvex lens?
A biconvex lens is used to converge light rays to a single point, creating a real image. It is commonly used in magnifying glasses, cameras, and projectors to focus and magnify images.
Image of object formed by a lens on the screen is not in sharp focus suggest a method to get clear focusing of the image on the screen without disturbing the position of the object lens or the screen?
You can adjust the position of the screen until the image is in sharp focus. This can be done by moving the screen closer or further away from the lens. Additionally, you can try using a lens with a larger aperture to allow more light to pass through and improve the focus of the image on the screen.
