## What happens to the pattern when the two slits are brought closer and farther apart?

Think of the point exactly between the two slits. The light waves will be traveling the same distance, so they will be traveling the same number of wavelengths. If your slits are further apart, the light waves will be coming from spots that are further apart.

## How would the fringe pattern change if the screen is moved closer to the slits?

So to get back to your question, the distance from the source to the slits is not a functional parameter for the fringe pattern to form —- the only difference will be the brightness of the fringes, as a source closer to the slits results in higher intensity radiation coming out of each.

## How does the intensity of central maximum change if the width of the slit is halved in a single slit diffraction experiment?

(a) When the slit-width is halved, the size of central maxima gets doubled. Its area becomes four times and hence its intensity would become one-fourth.

## What happens when the width of the slit aperture is decreased in an experiment of single slit diffraction?

What is the justification? Solution : (a) In a single slit diffraction experiment, if the width of the slit is made double the original width, then the size of the central diffraction band reduces to half and the intensity of the central diffraction band increases up to four times.

## What happens to wavelength in diffraction?

The amount of diffraction depends on the wavelength of light, with shorter wavelengths being diffracted at a greater angle than longer ones (in effect, blue and violet light are diffracted at a higher angle than is red light).

±2

## Which wavelengths colors are diffracted the most?

In the visible wavelengths of the electromagnetic spectrum, red, with the longest wavelength, is diffracted most; and violet, with the shortest wavelength, is diffracted least. Because each color is diffracted a different amount, each color bends at a different angle.

violet