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Light is incident on a glass plate (mu=1...

Light is incident on a glass plate (`mu=1.5`) that angle of refraction is `60^@`. Dark band is observed corresponding to the wave length of `6000overset(o)(A)` . If the thickness of glass plate is `1.2 xx 10^(-3)` mm. calculate the order of the interference band.

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`mu=1.5,r=60^(@),lamda=6000Å=6xx10^(-7)mimpliest=1.2xx10^(-3)=1.2xx10^(-6)m`
`n=(2mutcosr)/(lamda)=(2xx1.5xx1.2xx10^(-6)xxcos60^(@))/(6xx10^(-7))=(2xx1.5xx1.2xx10^(-6)xx(1)/(2))/(6xx10^(-7))=3`
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