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 In a Newton's ring experiment, radius of 8th bright ring observed as 1.95mm with a 75cm radii lens. Calculate the wavelength of the light used?
 A planoconvex lens of radius 3 m is placed on an optically flat glass plate and is illuminated by Neon light. The diameter of the 8^{th} dark ring in the reflected system is 7.2 mm. Calculate the wavelength of the light used?
 A thin equiconvex lens of focal length 4 m and refractive index 1.5 is placed on an optically flat glass plate. Using a light of wavelength 546 nm, Newton's rings are viewed normally by reflection. What is the diameter of the fifth bright ring?
 Newton’s rings are observed by keeping a spherical surface of 100 cm radius on a plane glass plate. The wavelength of light used is 5880 A^{0}. If the diameter of the 15th bright ring is 0.60 cm, then diameter of 5th ring is?
 Monochromatic light with a wavelength of 648 nm shines down on a planoconvex lens atop a plate glass. Newton's rings are seen when viewed from a superior position. (a) Radius of the 6thbright ring is 0.78cm. What is the radius of curvature of the lens? (b) Change the light to a greater wavelength; will the 6th ring be in the same position?
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