First slide

Diffraction

Question

Aperture of a human eye is 2 mm. Assuming the mean wavelength of light to be 5000 $\overset{0}{A}$ , the angular limit of resolution of the eye in radian is nearly (in rad).

Moderate

A

$2 \times 10^{- 4}$
B

$3 \times 10^{- 4}$
C

$0.5 \times 10^{- 4}$
D

$1.5 \times 10^{- 4}$

Solution

$angular resolution \frac{1.22 λ}{D} = \frac{1.22 \times 5 \times 10^{- 7}}{2 \times 10^{- 3}} = 3.05 \times 10^{- 4} rad$

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