Laser light of wavelength 647 nm is incident on a circular aperture which has a

Question

Laser light of wavelength 647 nm is incident on a circular aperture which has a diameter of 0.098 mm A diffraction pattern is observed on a screen which is placed 75 cm from the aperture. Give your answer to at least three significant figures. Answer must be accurate to 1%. What is the diffraction angle, e, of the first diffraction minimum? 0.461493 degrees You are correct. Previous Tries what is the distance on the screen, from the center of the central bright spot to the first dark ring 3.461 Cm Submit Answer Incorrect. Tries 3/20 Previous Tries Post Discussion

Explanation / Answer

for Circular Aperture Diffraction for first minima

sinteta = 1.22 * lambda/d

d = 0.098 mm = 0.098 x 10^-3 m

lambda = 647 nm = 647 x 10^-9 m

theta = 0.461493 degree

part b )

tan theta = y/L

theta = 0.461493 degree

L = 75 cm

y = 0.604106 cm

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