When visible light travels through a circular hole, it produces a...

The radius of the central diffraction disc (Airy disc) produced by a circular aperture on a screen is given by:

$r = \dfrac{1.22 \lambda D}{d}$

where $\lambda$ is the wavelength of the light, $D$ is the distance from the hole to the screen, and $d$ is the diameter of the hole.

For a given experimental set-up, $D$ and $d$ are constant, which implies $r \propto \lambda$.

The wavelength of X-rays is much smaller than the wavelength of visible light ($\lambda_{\text{X-rays}} < \lambda_{\text{visible}}$).

Therefore, the radius of the diffraction disc produced by X-rays will be smaller than that produced by visible light.

$r_{\text{X-rays}} < 0.1 \text{ mm}$