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i used x=lamda*d/a.... taking x as 4*10^-3 and a as 0.5, lamda as 600*10^-9 and 2d... i got 16 something so D as da asnwer...Great i officially suck @ physics so ya any 1 out there pretty plz help poor old me with this
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s06_qp_1.pdf
Q28
d ans is D
thanx a bunch