How to calculate focal length of a microscope objective. However that parameter is often considered as less important since magnification and numerical aperture are sufficient for quantifying the essential performance in a microscope. Typically the tube lens is an achromatic lens with a focal length of 200mm but other focal lengths can be substituted as well thereby customizing a microscope systems total magnification. The focal length of a microscope objective is typically between 2 mm and 40 mm.
Focal length is important because it determines the lens strength which is an indication of how much the lens enlarges the image. The left slider controls the tube length which varies from 160 to 210 millimeters. The calculator determines the focal length of a microscope objective given its magnification and the mechanical tube length for the finite conjugate microscopes or the reference focal length for infinity conjugate microscopes.
If you have a din microscope objective 160mm tube length not infinity corrected then the focal length is given by the following. Lens tube length cm. The calculator can perform calculations of the third value from any two other values.
Focal length objective cm. If you know the distance of the object youre magnifying from the lens and the focal length of the lens finding the distance of the image is easy with the lens equation. A lens with a shorter focal length will have a higher lens strength and will enlarge the image more.
The right slider controls the objective magnification which varies from 5x to 60x. The focal length is calculated according to the equations directly to the right of the optical components. If an objective is infinite conjugate there will be an infinity symbol located on the body of the objective.
The lens equation is 1f 1do 1di where f the focal length of the lens. M t m ob m ep. Lens strength is calculated by dividing the number one by the focal length taking the inverse of the focal length.
Microscope objective focal length calculator.
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