engineering recuitment AAI ATC Junior Executive 2025 Mock Test Series Physics Optics Diffraction

In a Newton’s ring experiment the diameter of 12th dark ring changes from 1.50 cm to 1.35 cm, when a liquid is introduced between the lens and the plate. Calculate the refractive index of the liquid?

1
1.5 
2
1.235
3
1.75
4
None
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