in a newton's rings experiment light of wavelentgth lamda and a lens of radius of curvature R are used The diffenence in diameters of 25 and 16 dark rings is
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So, the difference between the two diameter of 25 and 16 dark ring is equal to the diameter of the 1st dark ring.
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biralmahapatro15:
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interference fringes are observed with a biprism of refracting angle 1 degree and refractive index 1.5 on a screen 100 cm away from it, the wavelength of light used is 5890 angstrom. if the distance between the source and the biprism is 20 cm, the fringe width is
options 0.101, 0.202, 0.508, 0.680
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