Light from a helium-neon laser passes through a narrow slit and is incident ona screen 2.4m distance from the slit. The graph below shows the variation withintensity I of the light on the screen of distance x along the screen.-10-55x/ mm10(i)The wavelength of the light emitted by the laser is 630 nm. Use data from the graphabove to determine the width of the slit.

The expression for the path difference can be written as y=mλDa 1The width of the slit can be written as a=mλDy 2 From the graph, the path difference for the central maxima is 6 mm. Substitute the values in (2) to find the width of the slit. a=1630 nm×10-9m1 nm2.4 m6 mm×10-3m1 mma=2.52×10-4m 3

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Light from a helium-neon laser passes through a narrow slit and is incident on a screen 2.4m distance from the slit. The graph below shows the variation with intensity I of the light on the screen of distance x along the screen.