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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 from the given ones:
| 1. | (a) and (c) only |
| 2. | (a) and (d) only |
| 3. | (b) and (d) only |
| 4. | (b) and (c) only |
Subtopic: Â Diffraction |
Level 3: 35%-60%
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Consider sunlight incident on a slit of width \(10^{4}~\mathring{A}.\) The image seen through the slit shall:
| 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 |
Subtopic: Â Diffraction |
Level 4: Below 35%
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Consider the diffraction pattern for a small pinhole. As the size of the hole is increased:
| (a) | the size decreases |
| (b) | the intensity increases |
| (c) | the size increases |
| (d) | the intensity decreases |
Choose the correct option from the given ones:
| 1. | (a) and (b) only | 2. | (a) and (c) only |
| 3. | (b) and (d) only | 4. | (c) and (d) only |
Subtopic: Â Diffraction |
 58%
Level 3: 35%-60%
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