/**
 * @see https://en.wikipedia.org/wiki/Focal_length
 * @param {number} focal_length (in mm)
 * @param {number} [sensor_width] Width of camera sensor (in mm)
 * @returns {number} in Radians
 */
export function focal_length_to_fov(focal_length: number, sensor_width?: number): number;
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