Question
In single slit diffraction, explain why the maxima at $\theta=\left(n+\frac{1}{2}\right)\left(\frac{\lambda}{a}\right)$ becomes weaker and weaker as an increases. State two important differences between interference and diffraction pattern.
✓
Answer
As n increases. deviation of light from straight direction increases thus the light spread out more and which result in decreasing intensity of bright fringes.
In interference pattern the fringes are of equal width (dark and bright) and are of equal intensity and in diffraction the central maxima is brightest and its width is wider twice as compare to the other maxima and intensity of bands goes on decreasing as we move away from the Centre.
In interference pattern the fringes are of equal width (dark and bright) and are of equal intensity and in diffraction the central maxima is brightest and its width is wider twice as compare to the other maxima and intensity of bands goes on decreasing as we move away from the Centre.
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