system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If radio waves and visible light are just different wavelengths of light, why do we use antennas for radios and photo sensors for light?Why can’t we just use antennas for everything?
gpt
You can use antennae for visible light, they just have to be tiny due to the short wavelength of light vs radio. The issue is what you then do with it. 

If you want to produce a recognisable image with that light, you need an array of sensors, which is essentially what we have in our eye, or in ccd arrays in cameras. 

If you just want to detect a signal of light in the same way we do with radio, a lone antenna is fine, but we rarely want to do that.