NEET Physics Wave Optics Questions Solved

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NEET - 2016

The interference pattern is obtained with two coherent light sources of intensity ratio n. In the interference pattern, the ratio Imax-IminImax+Imin will be

(a) nn+1             (b) 2nn+1

(c) nn+12         (d) 2nn+12

  

(b) It is given that l2l1=nl2=nl1

  Ratio of intensites is given by

 lmax-lminlmax+lmin=l2+l12_l2-l12l1+l22+l2-l12

          =l2l1+12-l2l1-12l2l1+12+l2l1-12

=n+12-n-12n+12+n-12=2nn+1

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