Question

The diffraction pattern of a single slit consists of a central bright band which is
$\left( A \right)$ Wide, and is flanked by alternate dark and bright bands of decreasing intensity
$\left( B \right)$ Narrow, and is flanked by alternate dark and bright bands of equal intensity
$\left( C \right)$ Wide, and is flanked by alternate dark and bright bands of equal intensity
$\left( D \right)$ Narrow, and is flanked by alternate-dark and bright bands of decreasing intensity

Answer 1

Hint: When light travels in air, it encounters numerous phenomena like interference, refraction, reflection, and diffraction. Once the light comes connected with an obstacle so then the diffraction of light takes place.

Complete step by step solution When light passes through a little gap, comparable in size to the wavelength $\lambda $ of the light, the wavefront on the opposite aspect of the gap resembles the wave. Allow us to recognize a lot of regarding the diffraction of light and single slit optical phenomenon that happens once light travels through one slit.
We can observe single slit diffraction once light passes through one slit whose breadth $\left( W \right)$ is on the order of the wavelength of the light. The optical phenomenon pattern on the screen is going to be at a distance $L > > W$ far away from the slit. The intensity could be a function of angle.
We know that the breadth of the central optical phenomenon most is reciprocally proportional to the breadth of the slit. If we tend to increase the breadth size, the angle $\theta $ at that the intensity initial becomes zero decreases, leading to a narrower central band. And if we tend to build the slit breadth smaller, the angle $\theta $ will increase, giving a wider central band. So from the above now we can conclude that the wide fringes, and are flanked by alternate dark and bright bands of decreasing intensity will be noticed if such things happen.

Therefore the choice $A$ is like-minded to that.

Notes In the single-slit optical phenomenon experiment, we can observe the bending phenomenon of light or diffraction that causes light from a coherent supply interfere with itself and turn out a particular pattern on the screen known as the diffraction pattern