You produce an interference pattern by projecting a blue las

You produce an interference pattern by projecting a blue laser with a wavelength of 405 nm through the double slits you used in the today’s experiment. The lens is placed 51.2 cm from the screen. What is the distance between two adjacent bright spots? Show all work.

Solution

Let\'s assume separation between the slits is, d = 0.10mm = 10^-4 m

Wavelength of light, Lembda = 405 x 10^-9 m

Distance of screen, D = 51.2 x 10^-2 m

Distance between two adjacent bright spots = D x Lemda / d

= [51.2 x 10^-2 x  405 x 10^-9 ] / 10^-4 = 2.07 mm