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) 1.5 cm
B) 3.0 cm
C) 4.5 cm
D) 6.0 cm
E) 9.0 cm

Question

Quizplus · Accepted Answer

The spacing between consecutive bright fringes is given by the formula:

d = λD/d

where d is the slit separation, λ is the wavelength of light, and D is the distance from the slits to the screen.

For the first-order bright fringe, we have:

d1 = λD/d = (600 nm)(2.5 m)/(0.050 mm) = 30 mm

For the second-order bright fringe, we have:

d2 = 2d1 = 2(30 mm) = 60 mm

The spacing between the first-order and second-order bright fringes is:

d2 - d1 = 60 mm - 30 mm = 30 mm = 3.0 cm

Therefore, the best choice is B.

In a Double Slit Experiment,if the Separation Between the Two