The resultant amplitude due to superposition of two light waves having amplitudes a_1 and a_2 and initial phases alpha_1 and alpha_2 is:

The resultant amplitude due to superposition of two light waves having

1.	The resultant amplitude due to superposition of two light waves having amplitudes a_1 and a_2 and initial phases alpha_1 and alpha_2 is:
Answer» `R=sqrt(a_1^2+a_2^2+2a_1a_2)` `R=sqrt(a_1-a_2` `R=sqrt(a_1^2+a_2^2+2a_1a_2 COS(alpha_1-alpha_2)` `R=sqrt(a_1^2+a_2^2-2a_1a_2)` ANSWER :C

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The resultant amplitude due to superposition of two light waves having amplitudes a_1 and a_2 and initial phases alpha_1 and alpha_2 is:

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