LDR and LED Circuit design - Solid State Relay

The video tutorial explains the functioning of an LDR and LED, focusing on their resistance and current requirements. It details the design of a primary circuit using a white LED and a secondary circuit with a red LED. The tutorial covers calculating resistor values to control current and voltage drop, and demonstrates how to block ambient light to ensure proper circuit operation.

Describe the process to block ambient light from affecting the LDR.

What is the relationship between the white LED and the red LED in the circuit?