Problem 22.05 part a in a double slit experiment, if the separation between the two slits is 0.050 mm and the distance from the slits to a screen is 2.5 m, find the spacing between the first-order and second-order bright fringes when coherent light of wavelength 600 nm illuminates the slits.

a. 9.0 cm
b. 6.0 cm
c. 1.5 cm
d. 4.5 cm
e. 3.0 cm

Explanation:

Two slits with separation, d, and distance from the slits to a screen, L, produce bright fringes. The spacing, x, between the central fringe and the n-order bright fringe.

The spacing between the first and second bright is:

  distance on the y-axis and time on the x-axis.

explanation:

the instantaneous velocity = change in position/time taken

the slope of the graph should give instantaneous velocity.

  slope of a graph = change in value of y -axis / change in values of x -axis

  comparing both the equations

    change in value of y -axis = change in position

  change in values of x -axis = time taken

so position values should be on the y axis and time values should be on the x axis.

distance on the y-axis and time on the x-axis.