Question

In an experiment to measure the wavelength of light using a double slit apparatus, it is found that the bright fringes are too close together to easily count them. To increase only the spacing between the bright fringes, one could

A) increase the slit width

B) decrease the slit width

C) increase the slit separation

D) decrease the slit separation

E) none of these

Answer 1

The correct option is: (D) decrease the slit separation

Explanation:

Based on m λ = dx / L we want to increase x. d is separation of slits and less d means more x.