Adouble-slit experiment is performed using a helium-neon laser, with wavelength of 632.8 nm. the slit distance is 0.5 mm, and the distance to the screen is 1.8 m.

what is the width of the central bright fringe?

Width of central bright fringe will be 0.00228 m

Explanation:

We have given wavelength of light

Distance between the slits

Distance between slit and screen D = 1.8 m

We have to find the width

We know that width is given by

So width of central bright fringe will be 0.00228 m

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.