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The wavelength for a light in air is 720...

The wavelength for a light in air is `7200 overset@A`. What will be its wavelength in glass`(mu= 1.5)`?—

A

` 7200overset@A`

B

`7201.5overset@A`

C

`4800overset@A`

D

`5867overset@A`

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