Explanation:

• Neel Darpan is a Bengali play written by Dinabandhu Mitra in 1858–1859. The play was published in Dhaka in 1860, under a pseudonym of the author. The play was essential to Nil Vidroha, better known as the Indigo Revolt of February–March 1859 in Bengal, when farmers refused to sow indigo in their fields to protest against exploitative farming under the British Raj.