IB Physics SL C.3.8 Two-Source Interference Question Bank

Practise IB Physics SL C.3.8 by predicting two-source interference patterns and explaining how wavelength, spacing and path difference change them.

[Maximum number: 1]

This question is about interference.

Light from a laser is incident on two identical parallel slits. The light from the two slits produces a fringe pattern on a screen.

Figure for Question C.3.8—Two-source interference question 1 — IB Physics SL

A central bright fringe is produced at C . The next bright fringe is produced at A . There is a dark fringe at B .

State the phase difference between the light waves from the two slits that meet at B .

$180^{\circ} / \pi \mathrm{rad}$ ;

Marking guidance:

Do not accept $\frac{\lambda}{2}$ .

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C.3.8—Two-source interference question 1