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.

3. The central fringe is a dark spot then there are alternate bright and dark fringes (Ring shape).

4. Radius of n^th dark ring 

                        n = 0, 1, 2, ....., R = Radius of convex surface

5. Radius of n^th bright ring  

6. If a liquid of ref index m is introduced between the lens and glass plate, the radii of dark ring would be 

7. Newton's ring arrangement is used of determining the wavelength of monochromatic light. For this the diameter of n^th dark ring (D_n) and (n + p)^th dark ring (D_{n + p}) are measured then

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