A monochromatic light of frequency \(500\) THz is incident on the slits of a Young's double slit experiment. If the distance between the slits is \(0.2\) mm and the screen is placed at a distance \(1\) m from the slits, the width of \(10\) fringes will be:
1. \(1.5\) mm
2. \(15\) mm
3. \(30\) mm
4. \(3\) mm
Statement I: | If screen is moved away from the plane of slits, angular separation of the fringes remains constant. |
Statement Ii: | If the monochromatic source is replaced by another monochromatic source of larger wavelength, the angular separation of fringes decreases. |
1. | Statement I is False but Statement II is True. |
2. | Both Statement I and Statement II are True. |
3. | Both Statement I and Statement II are False. |
4. | Statement I is True but Statement II is False. |
Two coherent sources of light interfere and produce fringe patterns on a screen. For the central maximum, the phase difference between the two waves will be:
1. | zero | 2. | \(\pi\) |
3. | \(\dfrac{3\pi}{2}\) | 4. | \(\dfrac{\pi}{2}\) |
1. | there will be a central dark fringe surrounded by a few coloured fringes. |
2. | there will be a central bright white fringe surrounded by a few coloured fringes. |
3. | all bright fringes will be of equal width. |
4. | interference pattern will disappear. |