Aplano-convex glass lens of radius of curvature 1.8 m rests on an optically flat glass plate. the arrangement is illuminated from above with monochromatic light of 559-nm wavelength. the indexes of refraction of the lens and plate are 1.6. determine the radii of the first and second bright fringes in the reflected light.

0.000709 m

0.00122 m

Explanation:

R = Radius of curvature = 1.8 m

λ =  Wavelength = 559 nm = 559×10⁻⁹ m

Radius of bright fringe

First bright fringe means at m = 0

First second fringe means at m = 1

∴ Radius of the first bright fringe is 0.000709 m

∴ Radius of the second bright fringe is 0.00122 m

idk sorry i only needs point for apex

explanation: