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Most Important Selected Qs for JEE AdvancedPhysicsWave Optics

The point S is monochromatic source of light emitting light of wavelength . At the point P at a distance x from the mirror as shown in the figure, interference takes place between two light rays one directly coming from source S and another after reflection from the mirror such that a maxima is formed. The value of x may be:

Options

  1. A120
  2. B125
  3. C62.5
  4. D187.5

Correct answer

C. 62.5

Step-by-step solution

aligned & x=(S A+A P)-S P & =(S A+A B)-S P & =S B-S P aligned = (500 x)^2+(3 x)^2 - (500 x)^2+x^2 aligned & =500 x [ 1+ 9 500^2 - 1+ 1 500^2 ] & =500 x [ (1+ 9 2 500^2 )- (1+ 1 2 500^2 ) ] aligned = 500 x 2 500^2 [8]= 2 , 3 2 =62.5 , 187.5

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