can u please explain me what is principal focus and focal plane????
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Explanation:
Principal focus is a point on focal plane and is located on the principal axis. Focus is a point where rays parallel to each other meet. It is not necessary for the rays to be parallel to the principal axis. These are infinite foci, all lying in a plane called focal plane.
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Principal focus or focus or focal point of a lens is the point on the optical axis where a parallel to the axis light beam converge after it pass through a convex lens or seams to originate after it pass through a concave lens.
In camera design, a focal-plane shutter is a type of photographic shutter that is positioned immediately in front of the focal plane of the camera, that is, right in front of the photographic film or image sensor.
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