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Let a(1) and a(2) be that amplitude of t...

Let `a_(1) and a_(2)` be that amplitude of two light waves and `a_(1) and a_(2)` be their initial phases. The resultant amplitude due to supersition of two light waves is

A

`R= sqrt(a_(1)^(2)+a_(2)^(2)+2a_(1)a_(2))`

B

`R=a_(1)-a_(2)`

C

`R= sqrt(a_(1)^(2)+a_(2)^(2)+2a_(1)a_(2) cos (alpha-(1))alpha_(2)))`

D

`R=sqrt(a_(1)^(2)+a_(2)^(2)-2a_(1)-a_(2))`

Text Solution

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The correct Answer is:
C
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