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A semiconductor is illuminated by light at 900 nm with 500 W/m2 at a right angle to the semiconductor surface.

A semiconductor is illuminated by light at 900 nm with 500 W/m2 at a right angle to the semiconductor surface. The refractive index and the absorption coefficient at 900 nm of this semiconductor are 2.80 and 80.0/cm, respectively.

1) How much percentage of the incident light is reflected? 

2) Assuming the rear side is non-reflecting, how much is the minimum thickness required to absorb >95% of the light which is not reflected at the semiconductor surface? 

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