Chemistry, asked by hotgoodgirl, 5 hours ago

Compare double slit interference and double slit diffraction with respect to their fringe width and Intensity​

Answers

Answered by AtuhAtharva08
1

Explanation:

Difference between interference and diffraction.

Interference

Diffraction

1. Interference fringes are formed when the two light rays from the coherent sources are superimposed.

1. Fringes are formed due to super position of light rays from the same source.

2. All bright fringes are equally illuminated.

2. Central fringe is brightest and all other fringes have intensity in decreasing order.

3. Width of all fringes are always equal.

3. Fringe width decreases when we move away from the centre.

4. Minimum intensity is zero, so fringes can be distinguished very well.

4. Minimum intensity fringes are not perfectly darker so it is relatively difficult to distinguish bright and dark fringes.

Answered by evelin75
2

Answer:

To calculate the diffraction pattern for two (or any number of) slits, we need to generalize the method we just used for a single slit. That is, across each slit, we place a uniform distribution of point sources that radiate Huygens wavelets, and then we sum the wavelets from all the slits. This gives the intensity at any point on the screen. Although the details of that calculation can be complicated, the final result is quite simple:

Two-Slit Diffraction Pattern

Two-Slit Diffraction Suppose that in Young’s experiment, slits of width 0.020 mm are separated by 0.20 mm. If the slits are illuminated by monochromatic light of wavelength 500 nm, how many bright fringes are observed in the central peak of the diffraction pattern?

Solution From (Figure), the angular position of the first diffraction minimum is 

Using  for , we find

which is the maximum interference order that fits inside the central peak. We note that  are missing orders as  matches exactly. Accordingly, we observe bright fringes for

for a total of 19 bright fringes.

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