Which of the following is the purpose of the beam splitter in double beam photometer or colorimeter?

Question:Which of the following is the purpose of the beam splitter in double beam photometer or colorimeter?

1. Splits beam into two equal intensity beams

2. Splits beam into two equal intensity beams

3. Splits beam in such a way that a reference beam has higher intensity

4.Merge two equal intensity beams into single beam


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