In Young's double slit experiment, match the following two coloums.
`{:(,"Column I",,"Column II"),("A","When width of one slit is slightly increased",,"p. maximum intensity will increase"),("B","When one slit is closed",,"q. maximum intensity will decrease"),("C","When both the sources are made incoherent",,"r. maximum intensity will remain same"),("D","When a glass slab is inserted in front of one of the slits",,"s. fringe pattern will displacement"):}`
Note Assume absorption from glass slab to be negligible

Answer

A, B, C, D

Explanation

(a)`I_(max)=(sqrtI_(1)+sqrt(I_(2)))^(2)rArrI_(1)=I_(0)and I_(2)gtI_(0)`
`:.I_(max)gt4I_(0)`
(b) When one slit is closed, fringe pattern will disappear
`I_(max)=I_(min)=I_(0)`
(c) When both slits are made incoherent again fringe pattern will dissapear
`I_(max)=I_(min)=I_(1)+I_(2)=2I_(0)`
(d) Glass slab will only shift the fringe pattern.