Explanation:

Nil Darpan is a Bengali play written by Dinabandhu Mitra in 1858–1859. 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 rule. It was also essential to the development of theatre in Bengal and influenced Girish Chandra Ghosh, who in 1872 would establish the National Theatre in Calcutta (Kolkata), where the first play ever commercially staged was Nildarpan.