1. | angular separation of the fringes increases. |
2. | angular separation of the fringes decreases. |
3. | linear separation of the fringes increases. |
4. | linear separation of the fringes decreases. |
1. | \(\frac{I}{2}\) | 2. | \(\frac{I}{3}\) |
3. | \(\frac{3I}{4}\) | 4. | \(\frac{2I}{3}\) |
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
1. | \(60^\circ\) | 2. | \(75^\circ\) |
3. | \(30^\circ\) | 4. | \(45^\circ\) |
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. |
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. |
1. | the refracted light will be completely polarised. |
2. | both the reflected and refracted light will be completely polarised. |
3. | the reflected light will be completely polarised but the refracted light will be partially polarised. |
4. | the reflected light will be partially polarised. |
1. | fringe width decreases. |
2. | fringe width increases. |
3. | central bright fringe becomes dark. |
4. | fringe width remains unaltered. |