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Most Important Selected Qs for JEE AdvancedPhysicsWave Optics

A B C is a spherical wave front centred at O symmetric about B E is incident on silts S₁ and S₂ . B S₁=3 , S₁ S₂=4 , B O=6 , S₁ E=128 and is the wavelength of incident wave. A mica sheet of refractive index 1.5 is pasted on S₂ . The minimum value of thickness of mica sheet for which central bright fringe forms at E will be

Options

  1. A31 8
  2. B15 8
  3. C5 8
  4. D7 8

Correct answer

A. 31 8

Step-by-step solution

aligned & O S₁=3 & O S₂=5 aligned S₂ leads S₁ by 2 Net phase at E must be zero aligned & -2 + (128 )^2+(4 )^2 -128 +t / 2=0 & t / 2= 31 16 t= 31 8 aligned

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