CBSE Class 12 Physics 2014 Delhi Set 1 Paper

Question : 11

Total: 30

For a single slit of width a, the first minimum of the interference pattern of a monochromatic light of wavelength l occurs at an angle of ‌

. At the same angle of ‌

, we get a maximum for two narrow slits separated by a distance a. Explain.

Solution:

When a single slit is used, the interference pattern is due to the diffraction phenomenon. Since, corresponding wavelets from two halves of a single slit have a path difference of ‌

., the overlapping of their contributions in the first scenario results in a minimum. Because these wavefronts have a path difference of λ in the second example, the overlapping of the wavefronts from the two slits results in the first maximum.

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