If two slits were close enough together, then there would be areas where the diffraction effects would overlap.

In optics, it is a standard way of estimating diffraction effects.

An extremely small hole, however, can produce significant diffraction effects and a less clear image due to the wave properties of light.

Usually, it is sufficient to determine these minima and maxima to explain the observed diffraction effects.

If the diameter of the body is not small compared to the wavelength, diffraction effects have to be taken into account.

All of the segments also cause diffraction effects in the final image.

Such fiber uses diffraction effects instead of or in addition to total internal reflection, to confine light to the fiber's core.

This mask is designed to block light and also manage diffraction effects caused by removal of the light.

Possibly that was an atmospheric diffraction effect caused by the security screens.

As the gap becomes larger, the differentials between dark and light bands decrease until a diffraction effect can no longer be detected.