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If humans cannot see ultraviolet waves how can ultraviolet light be used to gather evidence of a crime

Answer :

pfellas
Ultraviolet light is invisible but it gets absorbed by body fluids like blood or semen and can be re-emitted as visible light. In a darkened crime scene, body fluids will show up and can be collected and analysed.
Laylafoxy123

Answer:

Ultra violet detects the presence of radioactive substances. Ultra violet light causes substances to fluoresce and give off visible light.

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