Question

If a maxima is formed at a detector, then the magnitude of wavelength $\lambda$ of the wave produced is given by

• A. $\pi R$
• B. $\frac{\pi R}{2}$
• C. $\frac{\pi R}{4}$
• D. all of these

Answer 1

The correct option is D all of these

Net path difference between the waves reaching at D, $x=\frac{3}{2}\pi R-\frac{\pi R}{2}=\pi R$

For maxima, $\pi R=n\lambda$

$\lambda =\frac{\pi R}{n}$

Thus $\lambda =\pi R,\frac{\pi R}{2},\frac{\pi R}{4}$ and so on.