Which of the following detectors is used to detect light intensities which are very weak?

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Question:Which of the following detectors is used to detect light intensities which are very weak?

1. Photomultiplier tube

2. Photomultiplier tube

3.Photoemissive tubes

4.Photo reflector

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  1. Which of the following detectors is used to detect light intensities which are very weak?
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