PHYSICS - Monochromatic Light Problem

Question

Monochromatic light with a wavelength of 6.4 E -7 meter passes through two narrow slits, producing an interference pattern on a screen 4.0 meters away. The first order bright band lines are 2.0 E -2 meters away from the central bright maxima.

What is the distance between the slits?

A.) 1.3 E -4 m

B.) 8.0 E -6 m

C.) 3.2 E -9 m

D.) 7.8 E3 m

Answer 1

See the ref.

d (sm. ang. approx.) = m*lambda*D/y = 0.000128 m, ans. A.

(m = 1)