NTA Abhyas JEE Main2020PhysicsWave OpticsPractice
White light is used to illuminate the two slits in Young's double-slit experiment. The separation between two slits is x and the screen is at distance z > > x from the slits. At a point on the screen directly in front of one of the slit which wavelength is absent?
Options
- A2 x 2 z
- B3 x 2 z
- Cx 2 5 z
- Dx 2 2 z
Correct answer
C. x 2 5 z
Step-by-step solution
y n t h   d a r k = 2 n - 1 λ D 2 d = 2 n - 1 × z 2 x x 2 = 2 n - 1 2 λ z x λ = x 2 2 n - 1 z λ = x 2 z for n = 1 λ = x 2 3 z for n = 2 λ = x 2 5 z for n = 3