10) What happens with the central spot when a liquid of refractive index μ greater than that of the lens and less than that of the glass plate is introduced between the lens and the glass plate?
Ans: Since the wavelength of light in a medium is reduced by a factor equal to its refractive index μ, the radius of each ring is reduced by a factor equal to square root of μ. Thus central spot’s radius decreases. And the central spot becomes bright
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