First slide

Diffraction

Question

What will be the angle of diffracting for the first minimum due to Fraunhofer diffraction with sources of light of wavelength 550 nm and slit of width 0.55 mm?

Easy

A

0.001 rad
B

0.01 rad
C

1 rad
D

0.1 rad

Solution

Using $dsinθ = nλ, for n = 1$
$sinθ = \frac{λ}{d} = \frac{550 \times 10^{- 9}}{0 .55 \times 10^{- 3}} = 10^{- 3} = 0 .001 rad$

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