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Newton's Rings-Refractive index of liquid



  • In a Newton's rings experiment, the diameter of the 10th ring changes from 14 mm to 12.7 mm when a drop of water is introduced between the lens and the plate. Calculate the refractive index of the liquid?


  • A plano-convex lens of radius 3 m is placed on an optically flat glass plate with acetone and is illuminated by monochromatic light. The diameter of the 8th dark ring in the reflected system is 7.2 mm. Calculate the wavelength of the light used?


  • A thin equi-convex 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 glass plate with isopropyl alcohol. The wavelength of light used is 5880 A0. 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 plano-convex lens atop a plate glass with kerosene.  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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