Physics ( light)

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A student doing Young's experiment measures a distance of 6.0 cm between the first and seventh nodal points on a screen located 3.0 m from the slit plate.
a) if the slit seperation is 220^ -6, what is the wave length of light being used ?
b) what colour is the light ?

• Physics ( light) -

x=2k•λ•L/2d= k•λ•L/d,
Δx=x7-x1 =
=7•λ•L/d - 1•λ•L/d = 6•λ•L/d,
λ = Δx•d/6•L =
=0.06•220•10^-6/6•3=
=7.3•10^-7 m .
Red light

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