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It is exact because, by international agreement, a metre is defined as the length of the path travelled by light in vacuum during a time interval of ​1⁄299792458 second.

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The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics. Its exact value is defined as 299792458 metres per second (approximately 300000 km/s, or 186000 mi/s)
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It is exact because, by international agreement, a metre is defined as the length of the path travelled by light in vacuum during a time interval of ​1⁄299792458 second.
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https://en.wikipedia.org/wiki/Speed_of_light
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The value of c can ... be found by using the relation c = fλ.
The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics. Its exact value is defined as 299792458 metres per second (approximately 300000 km/s, or 186000 mi/s)
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