Question

Two narrow paralle slits illuminated by tellow light with a wavelength of $\lambda$ = 600 nm produce fringes with a separation of 0.50 mm on a screen 2m away, Waht is the distnce between the slits ?

Answer 1

Answer 2

In a Young's double slit experiment,

the seperation between between successive bright fringes is w= DL/d

Here w= 0.50mm = 0.5*10^-3m

where D=distance with the screen = 2m

d=distance between the slits

L = wavelength of light = 600 nm = 600 *10^-9 m

So, d=DL/w= 2*(600*10^-9)/(0.5*10^-3)

=0.0024 m

=0.24 cm

=2.4 mm