Question

the answer is not c) or d). so is it a) or b) and why?

In Young's double-sit experiment, suppose that the distance to the screen, L, is not much larger than the slit separation, d. In that case, the interference pattern on the screen would be which of the following shifted down at smaller angles than are predicted by Equations 37.2 and 37.3 O shifted up at larger angles than are predicted by Equations 37.2 and 37.3 there would be no interference pattern on the screen O exactly the same as that predicted by Equations 37.2 andgo.3 Equation 37.2 Equation 373

Answer 1

Note that BC perpendicular AC and when D > > d, then BP almostequalto CP And hence, the path difference is AC = d sin theta = m L [For constructive interference] However, if D > d [not very large] then in this case Actual path difference < AC, therefore, the interference patterns are shifted up at larger angles than are predicted by equation 37.2 and 37.3 (b) is correct option