In Young\'s double slit experiment, both slits are illuminated by a laser beam a

Question

In Young's double slit experiment, both slits are illuminated by a laser beam and the interference pattern was observed on a screen.
a) If the wavelength of the laser beam is halved, the fringe spacing is:
halved

b) If the viewing screen is moved farther from the slit at twice the original distance, what happens to the interference pattern?


A)The dark fringes disappear.
B)The bright fringes disappear.
C)The fringes move further apart.
D)Nothing changes to the pattern.
E)The fringes get closer together.

Explanation / Answer

C)The fringes move further apart

The reason being the formula for spacing of fringes,

x = nL/d

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