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	Column I		Column II
(a)	Central fringe is bright and all fringes are equally spaced	(p)	Interference in wedge-shaped thin film
(b)	Central fringe is dark and all fringes are equally spaced	(q)	Young' s double slit experiment
(c)	Central fringe is bright and fringes are not equally spaced	(r)	Fraunhofer single slit diffraction experiment
(d)	All fringes are equally spaced	(s)	Lloyd' s mirror experiment

Chemistry

Fill in the Blank :
The lead chamber process involves oxidation of S O₂ by atmospheric oxygen under the influence of ......... as catalyst.

Mathematics

Passage Based Question
Passage I
A chess match between two grandmasters X and Y is won by whoever first wins a total of two games. X' s chances of winning, drawing or losing any particular game are a, b, c respectively. The games are independent and a + b + c = 1.
The probability that X wins the match after (n + 1) games (n

1) is
(a) na² b^n-1
(b) a²(n^{n - 1} + n (n - 1) b^{n - 2} c)
(c) na² bc^{n - 1}
(d) none of these

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