A plano-convex lens of radius of curvature m rests on an optically flat glass plate
PHYSICS · Subjective · Fermi University Physics · Optics & Photonics · Interference and diffraction · Interference and diffraction
Optics and Photonics, Ch Multiple-beam interference: thin films, multilayers and the Fabry-Perot etalon
Problem
A plano-convex lens of radius of curvature R=2.00 m rests on an optically flat glass plate, and Newton's rings are viewed from above in reflected sodium light (λ=589.3 nm). The observer's aperture only lets them see out to a radius of 10.0 mm from the point of contact. Estimate the number of dark rings visible within this radius.