First slide

Diffraction

Question

Given: width of aperture d = 3 mm and $λ = 500 nm .$ For what distance ray optics is a good approximation?

Moderate

A

18 m
B

18 nm
C

$18 Å$
D

18 light years

Solution

$D_{F} = \frac{d^{2}}{λ}$
$D_{F} = \frac{(3 \times 10^{- 3}) (3 \times 10^{- 3})}{500 \times 10^{- 9}} m$
$= \frac{90}{5} m = 18 m$

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