Physics

Problem

Light of wavelength

600\,\text{nm}

is used in air

(n=1)

to examine a specimen. To resolve details

0.50\;\mu\text{m}

apart, the microscope objective must have a semi-aperture angle

\alpha

such that

\text{NA}=\sin\alpha

. The required value of

\alpha

is closest to a)

37^{\circ}

42^{\circ}

53^{\circ}

30^{\circ}