Answer: 16 May
Notes: The International Day of Light, established by UNESCO, celebrates light's impact on society and technology. May 16th marks its observance, commemorating Theodore Maiman's 1960 laser breakthrough. In 2024, themed "Light in Our Lives," it highlights light's guiding role. Originating from the 2015 UN International Year of Light, IDL was adopted by UNESCO in 2016. Its inaugural celebration was on May 16, 2018, emphasizing the global significance of light science and its applications.
