Dinabandhu Mitra wrote "Neeldarpan" in 1860, making it one of the earliest critical literary works addressing the plight of indigo farmers in Bengal under British colonial rule. This play is significant in the context of Indian social reform and the resistance against exploitative practices during colonial times, reflecting broader themes of injustice and social awareness that emerged in the 19th century. Understanding such literary movements is crucial for the UPSC syllabus as it highlights the cultural response to colonialism and the development of nationalist sentiments within India.