Question

Three coherent beams of light get superposed on a point O.The intensity corresponding to each is I at point O.But phase of first wave is less than that of second by 2π/3 and greater than that of third by 2π/3.The resultant intensity at point O is

Answer 1

@michele_laino

Answer 2

@ganeshie8

Answer 3

Is the answer 0 ?

Answer 4

How did you get it?

Answer 5

Your ans is correct ..
Pls would you tell how u get that?

Answer 6

I'm sorry, I'm not good with physical optics

Answer 7

:( I thought you would help...
But it's okay!!

Answer 8

Take any two of the three waves

Would you agree that these two waves would be 120 degrees out of phase ?

Answer 9

Yep..i do..

Answer 10

Since they are meeting at a point so that means the angle subtended should be 2π then..
And we are given two angles already so third one will also b 2π/3

Answer 11

Yep. .Then??

Answer 12

Those are the phasors representing the 3 waves.
Add them vectorially, what do you get ?

Answer 13

0 vector...

Answer 14

One last thing...
Were i right in saying that the third angle is 2π/3 bcoz they are all meeting at single point O. And angle is 2π complete so angle is 2π/3...
Isn't it?

Answer 15

yes.. you are correct