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somecelxis
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Homework Statement
In a Young's double slit experiment , blue monochromatic light of wavelength 450nm is used to illuminate the slits which are 0.60mm apart. A screen is placed 1.5m form the slit is used to catch the interfrence pattern .
If red light is used (700nm) , how many red light will be seen? the ans is 7
Homework Equations
The Attempt at a Solution
dsinθ = m λ
0.6x10^-3 ( sin 90 ) = m (700x10^-9)
m = 857
no fringe can be seen = 857+ 857+1 ..
What's wrong with my working?