Question

Laser light of wavelength 625 nm is incident on a circular aperture which has a diameter of 0.063 mm.
A diffraction pattern is observed on a screen which is placed 53 cm from the aperture.

Give your answer to at least three significant figures. Answer must be accurate to 1%.

1.)What is the diffraction angle, θ, of the first diffraction minimum?

2.)What is the distance, on the screen, from the center of the central bright spot to the first dark ring?

Answer 1

step:1

given that

wavelength =625*10^-9 m

diameter d=0.063*10^-3 m

distance f=0.53 m

step:2

now we find the diffraction angle

diffraction angle =625*10^-9/63*10^-6

                       =0.00992

step:2

now we find the distance

distance d=0.53*625*10^-9/63*10^-6

               =5.26*10^-3 m