1. If we place a plano-convex lens on a plane glass layer, a thin layer of air is formed between the curved surface of the lens and plane glass plate.
2. If we allow monochromatic light to fall normally on the surface of lens, then circular interference fringes of radius r can be seen in the reflected light. This circular fringes are called Newton rings.
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![1157_Newtons Ring.png](https://www.expertsmind.com/../CMSImages/1157_Newtons Ring.png)
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3. The central fringe is a dark spot then there are alternate bright and dark fringes (Ring shape).
4. Radius of nth dark ring ![1682_Newtons Ring1.png](https://www.expertsmind.com/../CMSImages/1682_Newtons Ring1.png)
n = 0, 1, 2, ....., R = Radius of convex surface
5. Radius of nth bright ring ![69_Newtons Ring2.png](https://www.expertsmind.com/../CMSImages/69_Newtons Ring2.png)
6. If a liquid of ref index m is introduced between the lens and glass plate, the radii of dark ring would be ![820_Newtons Ring3.png](https://www.expertsmind.com/../CMSImages/820_Newtons Ring3.png)
7. Newton's ring arrangement is used of determining the wavelength of monochromatic light. For this the diameter of nth dark ring (Dn) and (n + p)th dark ring (Dn + p) are measured then
![1971_Newtons Ring4.png](https://www.expertsmind.com/CMSImages/1971_Newtons%20Ring4.png)
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