Which one of the following gives the minimum resolvable distance of an optical…

PHYSICS · Single correct · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments

Problem

Which one of the following gives the minimum resolvable distance

d_{\text{min}}

of an optical microscope in terms of the wavelength

\lambda

of light and the numerical aperture

\text{NA}

? (a)

\dfrac{\lambda}{\text{NA}}

(b)

\dfrac{\lambda}{2\,\text{NA}}

(c)

\dfrac{\lambda\,\text{NA}}{2}

(d)

0.61\,\dfrac{\lambda}{\text{NA}}