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# The diameter of the objective lens of microscope makes an angle $\;\beta\;$ at the focus of the microscope . Further, the medium between the object and the lens is an oil of refractive index n . Then the resolving power of the microscope .

(a) Increases with decreasing value of n(b) Increases with decreasing value of $\;\beta\;$(c) Increases with Increasing value of $\;n\;sin 2 \beta\;$(d) Increases with Increasing value of $\;\large\frac{1}{n\;sin 2 \beta}\;$