question_answer

Assuming human pupil to have a radius of 0.25 cm and a comfortable viewing distance of 25 cm, the minimum separation between two objects that human eye can resolve at 500 nm wavelength is:

A) \[100\mu m\]

B) \[~300\mu m\]

C) \[1\mu m\]

D) \[~30\mu m\]

Correct Answer: D

Solution :

[d] \[\sin \theta =\frac{0.25}{25}=\frac{1}{100}\] Resolving power\[=\frac{1.22\lambda }{2\mu \sin \theta }=30\mu m\].