Manipal MET2017PhysicsWave Optics
The width of a single slit if the first minimum is observed at an angle 2^ with a light of wavelength 6980 Å
Options
- A0.2 mm
- B2 10⁻⁵ ~mm
- C2 10^5 ~mm
- D2 mm
Correct answer
B. 2 10⁻⁵ ~mm
Step-by-step solution
The angular distance ( ) is given by = d Given, aligned =2^ & = 180 2, =6980 Å & =6980 10⁻¹⁰ ~m aligned array ll & d= = 6980 10⁻¹⁰ 180 3.14 2 & d 2 10⁻⁵ ~mm array