Consider sunlight incident on a slit of width `10^(4) Å` . The image seen through the slit shall

Options

A. be a fine sharp slit white in colour at the centre
B. a bright slit white at the centre diffusing to zero intensity at the edges
C. a bright slit white at the centre diffusing to regions of different colours
D. only be a diffused slit white in colour

Answer

A

Explanation

Here, the width of the slit is `10^(4)` Å, i.e. 10000 Å. The wavelength of (visible) sunlight varies from 4000 Å to 8000 Å. As width of slit ` a gt lambda` (wavelength of light), therefore no diffraction occurs. The image seen through the slit shall be a fine sharp slit white in colour at the centre.