The graph shows the intensity pattern from a two-slits interference experiment.

a. Determine the separation of the slits in terms of the wavelength of light used.

The graph shows the intensity pattern from a two-slits interference experiment.

b. Suggest how the pattern in the previous question change if the slit separation changes.

A grating with $400 \mathrm{lines} \mathrm{per} \mathrm{mm}$ is illuminating with the light of wavelength $600.0\mathrm{nm}$.

a. Determine the angles at which maxima are observed.

A grating with $400 \mathrm{lines} \mathrm{per} \mathrm{mm}$ is illuminating with the light of wavelength $600.0\mathrm{nm}$.

b. Determine the largest order that can be seen with which this grating and this wavelength.

Two very narrow, parallel slits separated by a distance of $1.4\times {10}^{-5}\mathrm{m}$ are illuminated by coherent, monochromatic light of wavelength $7.0\times {10}^{-7} \mathrm{m}$.

a. Describe what is meant by coherent and monochromatic light.

Two very narrow, parallel slits separated by a distance of $1.4\times {10}^{-5}\mathrm{m}$ are illuminated by coherent, monochromatic light of wavelength $7.0\times {10}^{-7} \mathrm{m}$.

b. Draw a graph to show the intensity of light observed on a screen far from the slits. 

Two very narrow, parallel slits separated by a distance of $1.4\times {10}^{-5}\mathrm{m}$ are illuminated by coherent, monochromatic light of wavelength $7.0\times {10}^{-7} \mathrm{m}$.

c. By drawing another graph on the same axes, illustrate the effect on the intensity distribution of increasing the width of the slits to $2.8\times {10}^{-5}\mathrm{m}$.