Chapter 11.5, Problem 2bT

Both slits are now uncovered.

For what angles will the light from each point on one slit be $180°$ out of phase with the light from the corresponding point on the other slit? (Hint: For small angles, $\sin \theta \approx \theta$ , where $\theta$ is in radians.)

On the relative intensity graph above, clearly label these angles.

When the second slit is uncovered, will the intensity at the locations of the diffraction minima increase, decrease, or slay the same? Explain.

When the second slit is uncovered, will the intensity at the locations at the diffraction minima pattern on the screen change? In the space below, show how the pattern would be different.