Question

The diameter of the pupil of human eye id about 2 mm. Human eyes is most sensitive to the wavelength of 555 nm. the limit of resolution of human eye is :

• A. 1.2min
• B. 2.4 min
• C. 0.6 min
• D. 0.3 min

Answer 1

Answer: (A)

1.2min

Answer 2

Limit of resolution,

$d\theta = \frac{1.22\lambda}{D} = \frac{1.22 \times 555 \times 10^{- 9}}{2 \times 10^{- 3}} = 3.39 \times 10^{- 4}rad$

$d\theta = 3.39 \times 10^{- 4} \times \left( \frac{180}{\pi} \right)$

$= 0.0194º = 0.0194 \times 60\min = 1.2\min$