Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
Most Important Selected Qs for JEE AdvancedPhysicsWave Optics

A parallel beam of visible light consisting of wavelengths ₁ and ₂ is incident on a standard YDSE apparatus with d =1 ~mm , D =1 ~m . P is a point on the screen at a distance y from center of screen O . At y=y₁ is the nearest point above O where the two maxima coincide and at y=y₂ is the nearest point above O where the two minima coincide. ₁ & ₂ are fringe width corresponding to wave length ₁ and ₂

Options

  1. A(A) - (P, R, S), (B) - (P, Q, S), (C) - (P, Q, S)
  2. B(A) - (P, S), (B) - (Q, S), (C) - (P, Q)
  3. C(A) - (R, S), (B) - (P, S), (C) - (Q, S)
  4. D(A) - (P, R, S), (B) - (Q, R, S), (C) - (P, Q, R)

Correct answer

A. (A) - (P, R, S), (B) - (P, Q, S), (C) - (P, Q, S)

Step-by-step solution

aligned & y₁=n₁ ₁=n₂ ₂=L C M of ₁ and ₂ & 2 y₁=2 n₁ ₁=2 n₂ ₂ aligned Hence at this point both maxima again coincide y ₂ ( n ₁- 1 2 ) ₁= ( n ₂- 1 2 ) ₂ ; ₁ ₂ = n ₂- 1 2 n ₁- 1 2 ₁ ₂ = 2 n ₁-1 2 n ₁-1 Which will have a solution. If ₁ ₂ expressed as a proper fraction will be of form odd odd . For (B and C) : ₁ ₂ is of form Odd even . Hence no solution i.e. the two minima will never coincide. For (A) ₁ ₂ is of form odd odd . Hence at some finite y₂ the two minima will coincide. At 2 y₂ the two maxima (and not minima) w

Practice Wave Optics on Quantrex Academy →

More from Wave Optics

In the List-I, four optical effects are mentioned. The physical phenomena of light which are essential to describe these optical effects are given in List-II. Choose the option whi 2026In a single slit diffraction experiment, a slit of width (0.016 0.002) mm is used to measure the wavelength of a monochromatic light source. In the diffraction pattern, the angular 2026As shown in the figure, a ray AB of unpolarized light enters from water of refractive index n_w = 4/3 into a medium of refractive index n_p = 4/ 3 after passing through a glass pla 2026Some distant star is to be observed by some telescope of diameter of objective lens a , at an angular resolution of 3.0 10⁻⁷ radian. If the wavelength of light from the star reachi 2026In a Young double slit experiment, the wavelength of incident light is 6000 Å, the separation between slits S₁ and S₂ is 5 cm and the distance between slits plane and screen is 50 2026In interference experiment the path difference between two interfering waves at a point A on the screen is /3 , where is the wavelength of these waves, and at another point B the p 2026An unpolarized light of intensity I_o passes through polarizer and then through a certain optically active solution and finally it goes to analyser. If the angle between analyser a 2026The maximum intensity in a Young's double slit experiment is I₀ . Distance between the slits ( d ) is 5 , where is the wavelength of light used. The intensity of the fringe, exactl 2026 Full Wave Optics list All Most Important Selected Qs for JEE Advanced PYQs