Consider sunlight incident on a pinhole of width \(10^{3}~\mathring{{A}}\). The image of the pinhole seen on a screen shall be:
| (a) | a sharp white ring |
| (b) | different from a geometrical image |
| (c) | a diffused central spot, white in colour |
| (d) | diffused coloured region around a sharp central white spot |
Choose the correct option:
1. (a), (c)
2. (a), (d)
3. (b), (d)
4. (b), (c)
(b, d) Hint: The diffraction occurs when the size of the obstacle in the path of light is comparable to the wavelength of the light.
Step 1: Find the shape of the image.
Given, width of pinhole = = 1000
We know that wavelength of sunlight ranges from 4000 A to 8000 .
Clearly, wavelength < width of the slit.
Hence, light is diffracted from the hole. Due to diffraction from the slit, the image formed
on the screen will be different from the geometrical image.
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