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A GaAs injection laser with an optical cavity has refractive index of 3.6. Calculate the reflectivity for normal incidence of the plane wave on the GaAs-air interface.

A GaAs injection laser with an optical cavity has refractive index of 3.6. Calculate the reflectivity for normal incidence of the plane wave on the GaAs-air interface. Correct Answer 0.32

The reflectivity for normal incidence of the plane wave on the GaAs-air interface is given by- r = ((n-1)/(n+1))2 where r=reflectivity and n=refractive index.

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