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  4. A monochromatic plane wave of speed c and wavelength λ is diffracted at a small aperture. The diagram illustrates successive wavefronts. After what time will some portion of the wavefront X Y reach P ?

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Q. A monochromatic plane wave of speed $c$ and wavelength $\lambda$ is diffracted at a small aperture. The diagram illustrates successive wavefronts. After what time will some portion of the wavefront $X Y$ reach $P$ ?Physics Question Image

Wave Optics

Solution:

The gap between successive wavefronts is $\lambda$. Here $t=\frac{(3 \lambda)}{c}$.