Q. ​A parallel beam of blue light (420nm) is incident on s small aperture. After passing through the aperture the beam is no longer parallel but diverges at 1 degree to the incident direction. What is the diameter of the 
aperture?

Q. From the phasor shown write down the wave equations and find the values of R and ϕ .

 

Dear student,

w=λsinθw=420×10-9msin1w=420×10-9msin(π180)w=24micro m=24μm

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Regards

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