| 1. | be a fine sharp slit white in colour at the centre |
| 2. | a bright slit white at the centre diffusing to zero intensities at the edges |
| 3. | a bright slit white at the centre diffusing to regions of different colours |
| 4. | only be a diffused slit white in colour |
Step 1: Find the size of the slit.
Given, the width of the slit \(=10^4 \mathring A\)
\(=10^4 \times 10^{-10} \mathrm{~m}=10^{-6} \mathrm{~m}=1 \mu \mathrm{~m}
\)
Step 2: Find the wavelength of the light.
The wavelength of (visible) sunlight varies from \(4000~\mathring A\)to \(8000~\mathring A.\)
As the width of the slit is comparable to that of wavelength, hence diffraction occurs with maxima at the centre. So, at the centre, all colours appear i.e., the mixing of colours forms a white patch at the centre.
Hence, option (1) is the correct answer.
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