fókuszsíkba

Fókuszsíkba is a Hungarian term that translates to "focal plane" in English. It refers to the plane within an optical system where light rays converge to form a sharp image. This concept is fundamental in photography, microscopy, and telescopes.

In photography, the focal plane is where the camera's sensor or film is positioned to capture a clear image. When a photographer adjusts the focus, they are essentially moving the lens or sensor to align the focal plane with the desired subject. If the focal plane does not match the subject's distance, the image will appear blurred.

For microscopes, the focal plane is the specific level at which the specimen is in sharp focus. Adjusting the focus knob on a microscope moves the objective lens or the stage up and down, changing the distance to the focal plane.

In astronomical telescopes, the focal plane is where the primary mirror or lens forms an image of a celestial object. Eyepieces are then placed at this focal plane to magnify the image for observation. Understanding the focal plane is crucial for achieving clear and detailed images in any optical instrument. The distance from the lens or mirror to the focal plane is determined by the focal length of the optical system.