8 A Newton s ring arrangement is used with a source emitting

Last updated: 6/7/2023

8 A Newton s ring arrangement is used with a source emitting two wavelengths 21 6000 A and 22 5000 A and it is found that nth dark ring due to 21 coincides with n 1 th dark ring for 22 If radius of curvature of the curved surface is 90 cm find the diameter of nth dark ring for 21 4 marks