Question

How can "Ali" distinguish the interference patterns produced by diffraction gratings from the interference patterns produced by a double-slit?

The interference pattern from a diffraction grating will have a wide, central bright band with alternate dark and bright bands on both sides, and the interference pattern will have an equally spaced dark and bright band.
The interference pattern from a diffraction grating will have a wide, central dark band with bright and dark bands on both sides, and the interference pattern will have bright narrow lines between dark bands.
The interference pattern from a diffraction grating will have narrow, equally spaced bright lines, and the interference pattern will have bright and dark bands.
The interference pattern from a diffraction grating will have narrow, equally spaced bright lines, and the interference pattern will have a wide central bright band with dark and bright bands on either side.

Answer 1

Answer:

The interference pattern from a diffraction grating will have a wide, central bright band with alternate dark and bright bands on both sides, and the interference pattern will have an equally spaced dark and bright band.

Explanation:

In diffraction pattern we know that the distance between two consecutive minimum position is maximum

So here position of minimum is given as

$asin\theta = N\lambda$

now we have central maximum is of maximum width while all other have width of decreasing order.

While when we use Young's double slit pattern then we can say that position of all maximum and minimum intensity on the screen will be at same distance.

so here we have

$y = \frac{N\lambda L}{d}$

so all the maximum and minimum intensity will have equal width.