H2P-628

Conditions for interference

H2 Physics · JC 2 · Easy · Conditions for interference

Red light of wavelength

650\text{ nm}

passes through a double slit and forms fringes on a screen. If the distance between the slits and the screen is doubled while all other factors remain the same, how does the fringe separation change according to

x = \lambda D / a

It doubles.
It halves.
It becomes four times as large.
It remains unchanged.

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