The radius of the central bright spot in t he diffraction

Last updated: 6/21/2023

The radius of the central bright spot in t he diffraction pattern of a circular hole of diameter d with light of wavelengt h is r and the distance between the ci rcular hole and screen is D Now the wh ole set up is immersed in a liquid of refr active index u and the distance betwee n the hole and the screen is reduced b y 2 times the radius of central bright sp ot reduced by 4 times The value of u is