manfaat GELAP dan TERANG apa saja ?

[cumi polos]

Stroboscopic effect
Main article: Stroboscopic effect

A strobe light flashing at the proper period can appear to freeze or reverse cyclical motion.
Special calibrated strobe lights, capable of flashing up to hundreds of times per second, are used in industry to "stop" the motion of rotating and other repetitively-operating machinery and to measure, or adjust, the rotation speeds or cycle times.

hanya dgn lampu stobe (kedipan gelap terang yg cepat), maka kita dpt melihat barang yg bergerak cepat...
seakan akan dibeku...

[real]

kegelapan berfungsi baik saat cuci foto