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For n=1 lamda=0.000120cm which lies in infrared region
For n=2 lamda=0.000060cm which lies in visible region
For n=3 lamda=0.000040cm which lies in visible region
For n=4 lamda=0.000030cm which lies in ultraviolet region
Hence absent wavelengths in reflected region are 0.000060cm and 0.000040cm
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