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Most Important Selected Qs for JEE AdvancedPhysicsWave Optics

Paragraph: Refracting angles of biprism are both 0.15^ . Distance of biprism from source is 30 cm . Distance between source and screen is 140 cm . The Fresnel's biprism arrangement shown in the figure uses a source of light of wavelength 6000 Å . When a converging lens is moved between the biprism and the screen two images of S are focused on the screen for two positions of the lens. The separations between the two i

Options

  1. A1.46
  2. B1.56
  3. C1.66
  4. D1.76

Correct answer

D. 1.76

Step-by-step solution

aligned & =( -1) A & d=s₁ s₂=2 30 cm . aligned aligned & s ₁ ~s ₂= 0.9 1.6 ~mm & Fringe width, B = D d aligned

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