Question
Write down difference between the Interference pattera and the diffraction pattern.
✓
Answer
| Interference pattern | Diffraction pattern | |
| (1) | In an interference pattern, there are many bright and dark bands at equal distance from each other. | In a diffraction pattern, the central maximum has width double the width of other secondary maxima. |
| (2) | Intensity of all the bright fringes is same. | Intensity of the central maximum is the highest and intensity gradually keeps reducing for successive secondary maxima, |
| (3) | An interference pattern is seen because of super position of two waves created from two narrow slits. | A difference pattern is seen because of super position of continuous wave fronts created from each point of the single slit. |
| (4) | ♦ For constructive interference phase difference is $\pm 2 n \pi$ (where $n=0,1,2, \ldots)$ ♦ For destructive interference phase diff. is $\pm(2 n+1) \pi$ (where $n=0,1,2,3 \ldots)$ | ♦ For central maxima $\theta \approx 0$ ♦ secondary maxima phase diff. is $\left(n+\frac{1}{2}\right) \frac{\lambda}{a}$ (where $n= \pm 1, \pm 2, \pm 3 \ldots$ ) ♦ Secondary minima phase diff. is $\frac{n \lambda}{a}$ (where $n= \pm 1, \pm 2, \pm 3 \ldots$ ) |
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