The overall aim of this experiment is to investigate the relationship between the distance between the slits and the screen, D, and the fringe width, w
The setup of apparatus required to measure the fringe width w for different values of D
The overall aim of this experiment is to calculate the wavelength of the laser light using a diffraction grating
The setup of apparatus required to measure the distance between maxima h at different angles θ
The diffraction grating equation is given by:
A student investigates the interference patterns produced by two different diffraction gratings. One grating used was marked 100 slits / mm, the other was marked 300 slits / mm. The distance between the grating and the screen is measured to be 3.75 m.The student recorded the distance between adjacent maxima after passing a monochromatic laser source through each grating. These results are shown in the tables below.Calculate the mean wavelength of the laser light and compare it with the accepted value of 635 nm. Assess the percentage uncertainty in this result.