Question: please help this thermodynamics and wave questions with clear steps and details, thanks 6. When a Newton's ring apparatus is immersed in a liquid. the
please help this thermodynamics and wave questions with clear steps and details, thanks

6. When a Newton's ring apparatus is immersed in a liquid. the diameter of the eighth dark ring decreases from 2.92 cm to 2.48 cm. What is the refractive index of the liquid
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