Question

1.What happened to the patterns when you increased the wavelength of the light?

2.Explain why your answer to #1 occurred.

3.What happens to the diffraction pattern if d is increased? What if d is decreased?

4. Explain your reasoning for 3. Insert screenshots here to prove your point.

5. Name one of effects of diffraction seen in every day of life.

Answer 1

We know that, fringe width of the pattern is,

F = wavelength * slit difference / screen slit distance

So,

1) if wavelength is increased fringe width of the pattern increases and in result the the pattern will expand.

2) from the formula mentioned above you can figure it out.

3) d is the slit difference, so if it is increased the pattern will expand itself and if it is decreased the pattern will shrink.

4) from the fringe width : the distance between the two minimas or maxima results in the expansion or shrinkage of the pattern. If any of the factor is varied it changes and the pattern gets changed according to it.

5) one of the most common and important example is the appearance of sun to be red due to diffraction from dust particles present in atmosphere.