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physics.....TOUGH QUESTION

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yinyang:
can someone explain Q25 (p12 nov 2009)

astarmathsandphysics:
sinx=nw/d
d=0.001/300=3.3*10^-6
w=450*10^-9
sin x =n*5/37<1
n<37/5=7.4
n=7

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