The penetration of light into the region of geometrical shadow is called:

$A$ diffraction pattern is obtained by using a beam of red light. If the red light is replaced by blue light,then:

$A$ single slit of width $a$ is illuminated by violet light of wavelength $400 \ nm$ and the width of the diffraction pattern is measured as $y.$ When half of the slit width is covered and illuminated by yellow light of wavelength $600 \ nm$,the width of the diffraction pattern is

In a diffraction experiment from a single slit,the angular width of the central maximum does $NOT$ depend upon:

The diffraction effect can be observed in

The angular width of the central maximum in a single-slit diffraction pattern does not depend on .........