AP EAMCET202319 May 2023Morning ShiftPhysicsWave OpticsActual
In a Young's double slit experiment, a laser light of wave length 560 ~nm produces an interference pattern with consecutive bright fringe's separation of 7.2 ~mm . Now another light is used to produce an interference pattern with consecutive bright fringes' separation of 8.1 ~mm . The wavelength of second light is
Options
- A680 ~nm
- B630 ~nm
- C650 ~nm
- D540 ~nm
Correct answer
B. 630 ~nm
Step-by-step solution
Wave length of light, =560 ~nm =560 10⁻⁹ ~m Fringes separation, aligned & ₁=7.2 10⁻³ ~m & ₂=8.1 10⁻³ ~m aligned As we know aligned & = D d & ₁ ₂ = ₁ ₂ ₂= ₁ ₂ ₁ & = 560 10⁻⁹ 8.1 10⁻³ 7.2 10⁻³ =630 ~nm aligned