Consider sunlight incident on a slit of width . 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 |
Consider sunlight incident on a pinhole of width . 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
1. (a, c)
2. (a, d)
3. (b, d)
4. (b, c)
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
1. (a, b)
2. (a, c)
3. (b, d)
4. (c, d)