1 Yes,its can help the police find the criminal.
2 To keep our body temperature,prevent us from being infected
3 protect our head
4 green,as the dress absorb all the color in white light except red,and the color "red" is reflected by the dress,we all know that when the white color lack of red,it takes on green
5 I wear glasses,and when I have some sports,I wear contact lenses,its help me read and look at things clearly,i needn't worry about my eyesight any more.