Visible light passing through a circular hole forms a diffraction disc of radius 0.1 mm on a screen. If X-ray is passed through the same set-up, the radius of the diffraction disc will be

Question

Philoid · Accepted Answer

From the theory of diffraction, the radius of diffraction varies directly with the wavelength. So, radius is smaller for smaller wavelengths (X-rays) and larger for larger wavelengths (visible light)