Consider the following negative production externality as depicted: 
Identify the social optimum and explain what methods the government could use to achieve this outcome.
Definitions:
Tears
The liquid produced by the lacrimal glands to lubricate, clean, and protect the eyes from irritation and infection.
Regulate Light
To control or adjust the intensity, duration, or quality of light in a given environment or system.
Iris
The colored part of the eye surrounding the pupil, responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina.
Lens
An optical device that bends and focuses light rays, used in glasses, cameras, and various optical instruments.
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