1.

Which of the following changes to a double-slit interference experiment with light would increase the widths of the fringes in the diffraction pattern that appears on the screen?

Answer»

Use light of a shorter wavelength
Move the screen closer to the slits
Move the slits closer together
Use light with a lower wave speed

Solution :Relative to the CENTRAL maximum, the locations of the bright fringes on the screen are given by the EXPRESSION mL(`lamda//d)`, where `lamda` is the wavelength of the light used, L is the distance to the screen, d is the SEPARATION of the slits, and m is an integer. the width of a FRINGE is, therefore (m+1)`L(lamda//d)-mL(lamda//d)=lamdaL//d`. one way to increase `lamdaL//d` is to DECREASE d.


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