Question

Which letter represents the wavelength of the light in the Young's double slit experiment?

• A. A
• B. B
• C. C
• D. D
• E. E

Answer 1

The correct option is D D

From figure, path difference between the lights reaching the point A is equal to D.

For constructive interference, path difference $\Delta x=n\lambda$ where $\lambda$ is the wavelength of the light

$\therefore$ $D=n\lambda$ $⟹\lambda =$ D for $n=1$

Thus wavelength of the light is represented by D.