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A source emits light of wavelength 4700 ...

A source emits light of wavelength `4700 Å , 5400 Å` and `6500 Å` . The light passes through red glass before being tested by a spectrometer. Which wavelength is seen in the spectrum

A

`6500 Å`

B

`5400 Å`

C

`4700 Å`

D

All the above

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The correct Answer is:
a
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