As I was learning to garden, I repeatedly heard the “experts” telling us not to water in the middle of the day. The prevailing wisdom was that any water droplets on the foliate would act as little magnifying glasses, burning tender leaves. (Think of using a magnifying glass to start a campfire, and you get the idea.)
Then, we all learned that this was a gardening myth. Water droplets are too close to the plant tissue for sunlight to focus on the leaf and cause any damage.