A laboratory has two optical setups illuminated by the same monochromatic laser at equal distances from their screens.
• Setup X produces many extremely sharp, narrowly spaced bright lines with almost no light between them.
• Setup Y produces bright and dark fringes of moderate width that lie within a broad central envelope.
Which statement best identifies the most probable configuration of each setup?
a) X is a diffraction grating with hundreds of parallel slits; Y is a single-slit aperture
b) X is a double-slit apparatus; Y is a diffraction grating with many slits
c) X is a diffraction grating with hundreds of parallel slits; Y is a double-slit apparatus
d) X is a double-slit with slit separation comparable to slit width; Y is a single-slit aperture