Question

question is above........​

Answer 1

ⒽⓁⓄ ⓜⓐⓣⓔ ❤

phase difference = 2π∆x / lemda

= 2π / lemda × lemda / 6

= π/3

using I = Io cos ^2fai / 2, we have

I = 3/4 Io

I / Io = 3/4

✌✌✌

Answer 2

Explanation:

Check the attachement :)