JEE Mains 28-July-2022 Shift 1 Solved Paper

In a Young's double slit experiment, a laser light of 560‌nm produces an interference pattern with consecutive bright fringes' separation of 7.2‌mm. Now another light is used to produce an interference pattern with consecutive bright fringes' separation of 8.1‌mm. The wavelength of second light is ________ nm.