Question

In a single slit diffraction experiment, intensity at $1^{st}$ maxima is equal to $10{\text{Wm}}^{-2}$. The intensity at the central maxima is approximately

• A. $11{\text{Wm}}^{-2}$
• B. $22{\text{Wm}}^{-2}$
• C. $110{\text{Wm}}^{-2}$
• D. $220{\text{Wm}}^{-2}$

Answer 1

The correct option is D $220{\text{Wm}}^{-2}$

We know that, from intensity curve, the intensity at $1^{st}$ maxima is given by

$I_1=\frac{I_0}{22}$

Where $I_0\Rightarrow$ Intensity of central maximum.

$\Rightarrow I_0=22I_1$

$\therefore I_0=220{\text{Wm}}^{-2}$

Hence, option $\left(\text{D}\right)$ is correct.