Why is it advisable not to look directly at the Sun? Please Give scientific reason for your answer

Hey there!

The sun's UV radiation damages the light receptors of the retina, so we should not look at the sun directly, but during sunrise and sunset the sunlight is coming at us horizontally rather than vertically. It has traveled many miles through the atmosphere to reach our eyes.

Hope this work for you.

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete