Question

How it will affect the interference pattern on the screen if in a double slit interference experiment, we increase the distance between the slits and the screen?

a. interference pattern on the screen becomes close to each other
b. interference pattern becomes dim
c. interference pattern becomes brighter
d. interference pattern on the screen becomes farther apart

Answer 1

The interference pattern on the screen will become farther apart (option d) if the distance between the slits and the screen is increased.

Step-by-step explanation:

The interference pattern on the screen will become farther apart if we increase the distance between the slits and the screen in a double slit interference experiment.

This is because the interference pattern is determined by the equation d sin θ = mλ, where d is the distance between the slits, θ is the angle of the diffracted light, m is an integer representing the order of the bright fringe, and λ is the wavelength of the light.

If we increase the distance d, the value of sin θ decreases, which means that the angle θ gets smaller. As a result, the bright fringes on the screen will spread out and become farther apart.