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(D) The angular width of the central diffraction maximum for a circular aperture is given by $	heta \approx \frac{1.22 \lambda}{D}$,where $D$ is the

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its size decreases,but intensity increases

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(D) The angular width of the central diffraction maximum for a circular aperture is given by $	heta \approx \frac{1.22 \lambda}{D}$,where $D$ is the diameter of the pinhole and $\lambda$ is the wavelength of light.As the diameter $D$ of the pinhole increases,the angular width $	heta$ decreases,which means the size of the diffraction pattern decreases.Since the total amount of light passing through the pinhole increases as the area of the pinhole increases (area $\propto D^2$),and this light is now concentrated into a smaller area,the intensity of the diffraction pattern increases.Therefore,the size decreases and the intensity increases.

Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter $0.1 \, \mu m$. If the diameter of the pinhole is slightly increased,it will affect the diffraction pattern such that :

Similar Questions

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