Consider sunlight incident on the slit of width of 10^4 A. The image seen through the slit shall

Dear student

Correct answer is  (A)Be a fine sharp slit white in colour at the centre.

For observing diffraction we must have the size of the slit almost comparable to the wavelength of light.
In the given question, the slit width is 10⁴ A or 10³ nm and the range of the visible spectrum is 380 nm (Violet) to 700 nm (Red).
So slit width and wavelength of light  are not comparable in nature due to which diffraction will not occur
hence a fine sharp slit white in colour will be formed due to the mixing of all colours.

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