What will be effect on newtons rings, Physics

What will be effect on Newton's rings if:

(a) A little oil (μ=1.65) is introduced between the lens (μ=1.5) and the glass plate (μ=1.75)

(b) A plane mirror is placed instead of the glass plate below the plano-convex lens

(c) The plano-convex lens is raised by height ?h from the surface of plan glass plate

 

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