Question

Consider sunlight incident on a slit of width $10^{4} ?$ . The image seen through the slit shall

• A. be a fine sharp slit white in colour at the centre
• B. a bright slit white at the centre diffusing to zero intensities 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 1

Answer: (A)

be a fine sharp slit white in colour at the centre

Answer 2

Visible range,$\lambda = 3900 ?$ to $7000 ?$ Given width of the slit, $a = 10^4 ? = 10000 ?$ Thus $a > \lambda$, Hence, no diffraction occurs. The image seen through the slit shall be a fine sharp slit white in colour at the centre.