Q (ii) In Young's double slit experiment using monochromatic light of wavelength λ, the intensity of light at a - Physics - Wave Optics

Question

Q (ii) In Young's double slit experiment using monochromatic light
of wavelength λ , the intensity of light at a point on the
screen where path difference is λ , is K units Find out the
intensity of light at a point where path difference is λ /
3
Plz experts only give the answer and no links plz and also specify
any formula used experts

Decoder_2 · Accepted Answer

Dear student,

let ϕ is  the difference between two light waves,also , I1 =I2=Ithe resultant intensity is given by,IR=I+IIR=2I+2IIR=4Igiven 4I=kas when path difference is λ3 phase difference is 2π3  radius,so,I'R=I+I+2I1I'R=2I+2I(-12)I'R=INow, I'RIR=I4Iso, I'R=IR4=k4therefore intensity is one fourth of the initial valueRegards