Question

Find the ratio of intensities of two points p and q on a screen in the ydse when waves from sources s1 and s2 have path difference of 0 and lambda/4 respectively

Answer 1

The ratio of intensities of two points p and q on a screen is 2 : 1

Explanation:

At P:Δx = 0

Δϕ = 2πλ × 0  = 0

IP = (I–√+I–√)2 = 4I

at Q : Δx = λ4

IQ = I + I + 2 √II cos(π2)

IQ = 2I , IP / IQ = 4I / 2I

IQ =2 / 1

Thus the ratio  of intensities of two points p and q on a screen is 2 : 1

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