First slide

Diffraction of light-Wave Optics

Question

What will be the angle of diffraction for the first minimum due to Fraunhoffer diffraction with sources of light of wave length 550 nm and slit of width 0.55 mm

Moderate

A

0.001 rad
B

0.01 rad
C

1 rad
D

0.1 rad

Solution

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

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