Figure 34-7 in Giancoli illustrates the principle of double-slit interference. I

Question

Figure 34-7 in Giancoli illustrates the principle of double-slit interference. It should remind you of the water-tank experiments that used point sources or a double-slit barrier. The path difference in the optics experiment is the difference in the paths traveled by light rays passing through slits 1 and 2, respectively. According to the figures, you will observe that a particular point on the screen is All points on the screen are dark because of interference. dark when the path difference is half a wavelength and bright when it is a full wavelength, dark when the path difference is a full wavelength and bright when it is half a wavelength. All points on the screen are bright because of diffraction.

Explanation / Answer

From figure (b), it is clear that a particular point on the screen is bright when path difference is full wavelength.

From figure (c), it is clear that a particular point on the screen is dark when path difference is half wavelength.

Hence, second option is correct.

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