Question

If $I_0$ is the intensity of the principal maximum in the single slit diffraction pattern, then what will be its intensity when the slit width is doubled ?

• A. $2I_0$
• B. $4I_0$
• C. $I_0$
• D. $\frac{I_{0}}{2}$

Answer 1

Answer: (B)

$4I_0$

Answer 2

$I=I_{0}\left(\frac{sin\,\theta}{\theta}\right)^{2}$ and $\theta=\frac{\pi}{\lambda}\left(\frac{ay}{D}\right)$ For principal maximum $y- 0$ $\therefore \theta=0$ Hence, intensity will remain same .