Beam divergence

#lens

import math

def calculate_beam_divergence(focal_length, wavelength):
    """
    Calculate the beam divergence (half-angle) based on lens properties and wavelength.

    Parameters:
        focal_length (float): The focal length of the lens (in meters).
        wavelength (float): The wavelength of the laser beam (in meters).

    Returns:
        beam_divergence (float): The beam divergence in radians.
    """
    beam_divergence = (wavelength / (math.pi * focal_length))
    return beam_divergence

# Example usage:
if __name__ == "__main__":
    lens_focal_length = 0.1  # Focal length of the lens in meters
    laser_wavelength = 532e-9  # Laser wavelength in meters (532 nm in scientific notation)

    divergence_angle = calculate_beam_divergence(lens_focal_length, laser_wavelength)

    # Convert radians to degrees for a more readable output
    divergence_angle_degrees = math.degrees(divergence_angle)

    print(f"The beam divergence is approximately {divergence_angle_degrees:.2f} degrees.")