InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
with the help of a diagram, describeYoungs double slit experiment todemonstrate interference of light.Decive an enpresion for intensityof fringes |
|
Answer» Young’s double slit experiment uses two coherent sources of light placed at a small distance apart, usually, only a few orders of magnitude greater than thewavelength of lightis used. A screen or photodetector is placed at a large distance ’D’ away from the slits as shown.The original Young’s double slit experiment used diffracted light from a single source passed into two more slits to be used as coherent sources. Lasers are commonly used ascoherent sourcesin the modern-day experiments.Each source can be considered as a source of coherentlight waves. At any point on the screen at a distance ‘y’ from the centre, the waves travel distancesl1andl2to create a path difference of Δl at the point in question. The point approximately subtends an angle of θ at the sources (since the distance D is large there is only a very small difference of the angles subtended at sources). |
|