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In a completely opaque medium, if $50\%$ of the incident monochromatic radiation is absorbed, then which of the following statements are $CORRECT$

  1. $50\%$ of the incident radiation is reflected
  2. $25\%$ of the incident radiation is reflected
  3. $25\%$ of the incident radiation is transmitted
  4. No incident radiation is transmitted
  1. $P$ and $S$ only 
  2. $Q$ and $R$ only
  3. $P$ and $Q$ only
  4. $R$ and $S$ only
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