The term "Annus Mirabilis" refers to the year 1905, which is often regarded as a remarkable year in the history of physics due to the publication of several groundbreaking papers by the physicist Albert Einstein. In that year, he produced four critical papers that laid the foundation for modern physics: 1. **Photoelectric Effect**: In this paper, Einstein proposed that light can be thought of as discrete packets of energy, called quanta or photons.
