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(B) The resolving power $R$ of a microscope is given by the formula: $R = \frac{2n \sin \alpha}{0.61 \lambda}$,where $n$ is the refractive index of th

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increase the refractive index of the medium between the object and objective lens.

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(B) The resolving power $R$ of a microscope is given by the formula: $R = \frac{2n \sin \alpha}{0.61 \lambda}$,where $n$ is the refractive index of the medium between the object and the objective lens,$\alpha$ is the semi-vertical angle,and $\lambda$ is the wavelength of light used.From the formula,it is clear that $R \propto n$.Therefore,by increasing the refractive index $n$ of the medium between the object and the objective lens,the resolving power of the microscope can be increased.

Column-$I$	Column-$II$
$(a)$ Land snail	$(1)$ Urea
$(b)$ Cartilaginous fishes	$(2)$ Uric acid
$(c)$ Marine fishes	$(3)$ Ammonia

$A$ person is observing a bacteria through a compound microscope. For better observation and to improve its resolving power,he should:

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Arrange the proper pair.

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$(a)$ Land snail $(1)$ Urea

$(b)$ Cartilaginous fishes $(2)$ Uric acid

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