Question

Diameter of human eye lens is 2 mm. What will be the minimum distance between two points to resolve them, which are situated at a distance of 50 meter from eye.The wavelength of light is 5000 Å

• A. 2.32 m
• B. 4.28 mm
• C. 1.25 cm
• D. 12.48 cm

Answer 1

Answer: (C)

1.25 cm

Answer 2

For the aparture, limit of resolution –

$\frac{y}{D}\geq \frac{\lambda}{d}$ \Rightarrow$$y\geq\frac{\lambda D}{d}

\Rightarrow$$y \geq\frac{5\times10^{-3}}{2\times10^{-3}}\times50$$\geq1.25 cm.