Question

What happens to fringe width when slit separation increases while wavelength and screen distance remain unchanged?

Options

• Fringe width changes randomly

• Fringe width becomes equal to screen distance

• Fringe width increases

• Fringe width decreases

Answer 1

Slit separation appears in the denominator of \\[\\beta=\\frac{\\lambda D}{d}\\]. Increasing slit separation therefore decreases fringe width.