Question

Newton's rings are observed with Plano
convex lens in contact with a glass plate.
The radius of the first ring is 1mm. If the
radius of the convex surface is 4m what
is the wave length of light used?​

Answer 1

Answer:

In a Newton's-rings experiment, a plano-convex glass (n = 1.52) lens having radius r =5.00 cm is placed on a flat plate as shown in Figure. When light of wavelength λ=650 nm is incident normally, 55 bright rings are observed, with the last one precisely on the edge of the lens.