When the light decreases the reverse minority-carrier current in a photodiode?

When light decreases, the generation of electron-hole pairs in a photodiode diminishes, leading to a reduction in the minority-carrier concentration. This results in a decrease in the reverse minority-carrier current, as there are fewer charge carriers available to contribute to the current flow. Consequently, the photodiode's response weakens, indicating less sensitivity to light. In essence, decreased light leads to lower photocurrent due to reduced carrier generation.