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Refractive index of air/ Refractive index of glass = wavelength in glass/ wavelength in air
(This is Snell's law)
1/1.5= x/7200
x = 7200/1.5
x = 4800A
(This is Snell's law)
1/1.5= x/7200
x = 7200/1.5
x = 4800A
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By Snell's law
refractive index in glass will be
1/1.5 = x/7200
x = 4800 A
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