Question

Aperture of the human eye is 2 mm. Assuming the mean wavelength of light to be 5000 $\stackrel{o}{A}$, the angular resolution limit of the eye is nearly:

• A. 2 minute
• B. 1 minute
• C. 0.5 minute
• D. 1.5 minute

Answer 1

The correct option is B 1 minute

If the angular limit of resolution of human eye is R then
R = $\frac{1.22\lambda }{a}$ = $\frac{1.22\times 5\times {10}^{-7}}{2\times {10}^{-3}}$ rad

= $\frac{1.22\times 5\times {10}^{-7}}{2\times {10}^{-3}}\times \frac{180}{\pi }\times 60$ minute = 1 minute