Physics-
General
Easy

Question

The figure shows a double slit experiment P and Q are the slits. The path lengths PX and QX are n lambda and left parenthesis n plus 2 right parenthesis lambda respectively, where n is a whole number and Error converting from MathML to accessible text. is the wavelength. Taking the central fringe as zero, what is formed at X

  1. First bright    
  2. First dark    
  3. Second bright    
  4. Second dark    

The correct answer is: Second bright


    For brightness, path difference equals n lambda equals 2 lambda
    So second is bright.

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