For hearing the loudest ticking sound heard by the ear, find the angle 1x
.

Explanation

We know that, in laws of reflection , tha angle of incidence (x) is always equal to the angle of reflection (x).
Since, AOB is a straight line.
`therefore angleAOB=180^(@)`
`therefore 50^(@)+x+x+50^(@)=180^(@)`

`" "(becuase` sum of all angles lies on the same side of aline is `180^(@))`
`2x+100^(@)=180^(@)`
`2x=180^(@)-100^(@)`
`2x=80^(@)`
`x=(80^(@))/(2)`
`x=40^(@)`
Hence , the value of x is `40^(@)`.