Question: Two light waves superimposing at the mid- point of the screen are coming from coherent source of lig...

Question

Two light waves superimposing at the mid- point of the screen are coming from coherent source of light with phase difference $3\pi$ rad. Their amplitudes are 1cm each. The resultant amplitude at the given point will be :

Answer 1

Solution

: Resulting amplitude

$A = \sqrt{A_{1}^{2} + A_{2}^{2} + 2A_{1}A_{2}\cos\varphi}$

Here $A_{1} = A_{2} = 1cm,\varphi = 3\pi rad$

}{= \sqrt{2 + 2 \times ( - 1)} = 0}$$