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Physics

Two identical prisms of refractive index

are kept as shown in the figure. A light ray strikes the first prism at face AB. Find,

(a) the angle of incidence, so that the emergent ray from the first prism has minimum deviation.
(b) through what angle the prism DCE should be rotated about C so that the final emergent ray also has minimum deviation.

Chemistry

Sodium nitrate decomposes above 800^oC to give

(a)

N₂

(b)

O₂

(c)

NO₂

(d)

Na₂O

Mathematics

For two given events A and B, P(A

(a)	not less than P (A) + P (B) - 1	(b)	not greater than P (A) + P (B)
(c)	equal to P (A) + P (B) - P (A B)	(d)	equal to P (A) +P (B) + P (A B)

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