IP Newton\'s Rings Monochromatic light with 643 nm shines down on a plano-convex

Question

IP Newton's Rings Monochromatic light with 643 nm shines down on a plano-convex lens lying on a piece of plate glass, as shown in the figure(Figure 1) . When viewed from above, one sees a set of concentric dark and bright fringes, referred to as Newton's rings.

a) If the radius of the twelfth dark ring from the center is measured to be 1.53 cm , what is the radius of curvature, R, of the lens?

b) If light with a longer wavelength is used with this system, will the radius of the twelfth dark ring be greater than or less than 1.53 cm ?

Explanation / Answer

radius = sqroot ( m R )

r = sqroot ( 12x 1.53 x 10^-2 x 643 x 10^-12) = 108.65 x 10^ -7 m

b) radous is directly proportional to , therefore a higher will result in greater radius

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