Director Meghna Gulzar is back with a bang after Talvar (2015) and Raazi (2018) with yet another socially relevant film, Chhapaak. Releasing on January 10, it is based on the rampant acid attack on girls across the country. It’s a biopic, to be precise, on Laxmi Agarwal, one of the survivors of the brutal attack, whose relentless fightback through a gritty legal battle led to the ban on the sale of acid in the country. In conversation with Giridhar Jha, Meghna speaks out, among other things, about the relevance of her latest movie, the reason behind casting Deepika Padukone in the main lead and why it is unfair to expect every celebrity to speak his mind out on public platforms on any issue. Excerpts: